diff --git a/packages/medusa/src/interfaces/__tests__/base-service.spec.ts b/packages/medusa/src/interfaces/__tests__/transaction-base-service.spec.ts
similarity index 56%
rename from packages/medusa/src/interfaces/__tests__/base-service.spec.ts
rename to packages/medusa/src/interfaces/__tests__/transaction-base-service.spec.ts
index 9166759fac..65c5b62608 100644
--- a/packages/medusa/src/interfaces/__tests__/base-service.spec.ts
+++ b/packages/medusa/src/interfaces/__tests__/transaction-base-service.spec.ts
@@ -1,12 +1,15 @@
-import BaseService from "../base-service"
-import { In, Not } from "typeorm"
+import { EntityManager } from "typeorm"
 import { MockManager } from "medusa-test-utils"
+import { TransactionBaseService } from "../transaction-base-service"
 
-describe("BaseService", () => {
+describe("TransactionBaseService", () => {
   it("should cloned the child class withTransaction", () => {
-    class Child extends BaseService<Child> {
+    class Child extends TransactionBaseService<Child> {
+      protected manager_!: EntityManager
+      protected transactionManager_!: EntityManager
+
       constructor(protected readonly container) {
-        super(container, {});
+        super(container);
         this.container = container
       }
 
@@ -32,30 +35,4 @@ describe("BaseService", () => {
     expect(child2.getTransactionManager()).toBeTruthy()
     expect((child2.getTransactionManager() as any)?.testProp).toBe('testProp')
   })
-
-  describe("buildQuery_", () => {
-    const baseService = new BaseService({}, {})
-
-    it("successfully creates query", () => {
-      const q = baseService.buildQuery_(
-        {
-          id: "1234",
-          test1: ["123", "12", "1"],
-          test2: Not("this"),
-        },
-        {
-          relations: ["1234"],
-        }
-      )
-
-      expect(q).toEqual({
-        where: {
-          id: "1234",
-          test1: In(["123", "12", "1"]),
-          test2: Not("this"),
-        },
-        relations: ["1234"],
-      })
-    })
-  })
-})
+})
\ No newline at end of file
diff --git a/packages/medusa/src/interfaces/base-service.ts b/packages/medusa/src/interfaces/base-service.ts
deleted file mode 100644
index 18560465f2..0000000000
--- a/packages/medusa/src/interfaces/base-service.ts
+++ /dev/null
@@ -1,342 +0,0 @@
-import { MedusaError } from "medusa-core-utils"
-import { EntityManager, FindOperator, In, Raw } from "typeorm"
-import { IsolationLevel } from "typeorm/driver/types/IsolationLevel"
-import { FindConfig } from "../types/common"
-
-type Selector<TEntity> = { [key in keyof TEntity]?: unknown }
-
-/**
- * Common functionality for Services
- * @interface
- */
-class BaseService<
-  TChild extends BaseService<TChild, TContainer>,
-  TContainer = unknown
-> {
-  protected transactionManager_: EntityManager | undefined
-  protected manager_: EntityManager
-  private readonly container_: TContainer
-
-  constructor(
-    container: TContainer,
-    protected readonly configModule: Record<string, unknown>
-  ) {
-    this.container_ = container
-  }
-
-  withTransaction(): this
-  withTransaction(transactionManager: EntityManager): TChild
-  withTransaction(transactionManager?: EntityManager): this | TChild {
-    if (!transactionManager) {
-      return this
-    }
-
-    const cloned = new (<typeof BaseService>this.constructor)<
-      TChild,
-      TContainer
-    >(
-      {
-        ...this.container_,
-        manager: transactionManager,
-      },
-      this.configModule
-    )
-
-    cloned.transactionManager_ = transactionManager
-
-    return cloned as TChild
-  }
-
-  /**
-   * Used to build TypeORM queries.
-   * @param selector The selector
-   * @param config The config
-   * @return The QueryBuilderConfig
-   */
-  buildQuery_<TEntity = unknown>(
-    selector: Selector<TEntity>,
-    config: FindConfig<TEntity> = {}
-  ): FindConfig<TEntity> & {
-    where: { [key in keyof TEntity]?: unknown }
-    withDeleted?: boolean
-  } {
-    const build = (
-      obj: Record<string, unknown>
-    ): { [key in keyof TEntity]?: unknown } => {
-      return Object.entries(obj).reduce((acc, [key, value]: any) => {
-        // Undefined values indicate that they have no significance to the query.
-        // If the query is looking for rows where a column is not set it should use null instead of undefined
-        if (typeof value === "undefined") {
-          return acc
-        }
-
-        const subquery: {
-          operator: "<" | ">" | "<=" | ">="
-          value: unknown
-        }[] = []
-
-        switch (true) {
-          case value instanceof FindOperator:
-            acc[key] = value
-            break
-          case Array.isArray(value):
-            acc[key] = In([...(value as unknown[])])
-            break
-          case value !== null && typeof value === "object":
-            Object.entries(value as Record<string, unknown>).map(
-              ([modifier, val]) => {
-                switch (modifier) {
-                  case "lt":
-                    subquery.push({ operator: "<", value: val })
-                    break
-                  case "gt":
-                    subquery.push({ operator: ">", value: val })
-                    break
-                  case "lte":
-                    subquery.push({ operator: "<=", value: val })
-                    break
-                  case "gte":
-                    subquery.push({ operator: ">=", value: val })
-                    break
-                  default:
-                    acc[key] = value
-                    break
-                }
-              }
-            )
-
-            if (subquery.length) {
-              acc[key] = Raw(
-                (a) =>
-                  subquery
-                    .map((s, index) => `${a} ${s.operator} :${index}`)
-                    .join(" AND "),
-                subquery.map((s) => s.value)
-              )
-            }
-            break
-          default:
-            acc[key] = value
-            break
-        }
-
-        return acc
-      }, {} as { [key in keyof TEntity]?: unknown })
-    }
-
-    const query: FindConfig<TEntity> & {
-      where: { [key in keyof TEntity]?: unknown }
-      withDeleted?: boolean
-    } = {
-      where: build(selector),
-    }
-
-    if ("deleted_at" in selector) {
-      query.withDeleted = true
-    }
-
-    if ("skip" in config) {
-      query.skip = config.skip
-    }
-
-    if ("take" in config) {
-      query.take = config.take
-    }
-
-    if ("relations" in config) {
-      query.relations = config.relations
-    }
-
-    if ("select" in config) {
-      query.select = config.select
-    }
-
-    if ("order" in config) {
-      query.order = config.order
-    }
-
-    return query
-  }
-
-  /**
-   * Confirms whether a given raw id is valid. Fails if the provided
-   * id is null or undefined. The validate function takes an optional config
-   * param, to support checking id prefix and length.
-   * @param rawId - the id to validate.
-   * @param config - optional config
-   * @returns the rawId given that nothing failed
-   */
-  validateId_(
-    rawId: string,
-    config: { prefix?: string; length?: number } = {}
-  ): string {
-    const { prefix, length } = config
-    if (!rawId) {
-      throw new MedusaError(
-        MedusaError.Types.INVALID_DATA,
-        `Failed to validate id: ${rawId}`
-      )
-    }
-
-    if (prefix || length) {
-      const [pre, rand] = rawId.split("_")
-      if (prefix && pre !== prefix) {
-        throw new MedusaError(
-          MedusaError.Types.INVALID_DATA,
-          `The provided id: ${rawId} does not adhere to prefix constraint: ${prefix}`
-        )
-      }
-
-      if (length && length !== rand.length) {
-        throw new MedusaError(
-          MedusaError.Types.INVALID_DATA,
-          `The provided id: ${rawId} does not adhere to length constraint: ${length}`
-        )
-      }
-    }
-
-    return rawId
-  }
-
-  shouldRetryTransaction(
-    err: { code: string } | Record<string, unknown>
-  ): boolean {
-    if (!(err as { code: string })?.code) {
-      return false
-    }
-    const code = (err as { code: string })?.code
-    return code === "40001" || code === "40P01"
-  }
-
-  /**
-   * Wraps some work within a transactional block. If the service already has
-   * a transaction manager attached this will be reused, otherwise a new
-   * transaction manager is created.
-   * @param work - the transactional work to be done
-   * @param isolationOrErrorHandler - the isolation level to be used for the work.
-   * @param maybeErrorHandlerOrDontFail Potential error handler
-   * @return the result of the transactional work
-   */
-  async atomicPhase_(
-    work: (transactionManager: EntityManager) => Promise<unknown>,
-    isolationOrErrorHandler?:
-      | IsolationLevel
-      | ((error: unknown) => Promise<unknown>),
-    maybeErrorHandlerOrDontFail?: (error: unknown) => Promise<unknown>
-  ): Promise<unknown | never> {
-    let errorHandler = maybeErrorHandlerOrDontFail
-    let isolation:
-      | IsolationLevel
-      | ((error: unknown) => Promise<unknown>)
-      | undefined
-      | null = isolationOrErrorHandler
-    let dontFail = false
-    if (typeof isolationOrErrorHandler === "function") {
-      isolation = null
-      errorHandler = isolationOrErrorHandler
-      dontFail = !!maybeErrorHandlerOrDontFail
-    }
-
-    if (this.transactionManager_) {
-      const doWork = async (m: EntityManager): Promise<unknown | never> => {
-        this.manager_ = m
-        this.transactionManager_ = m
-        try {
-          return await work(m)
-        } catch (error) {
-          if (errorHandler) {
-            const queryRunner = this.transactionManager_.queryRunner
-            if (queryRunner && queryRunner.isTransactionActive) {
-              await queryRunner.rollbackTransaction()
-            }
-
-            await errorHandler(error)
-          }
-          throw error
-        }
-      }
-
-      return doWork(this.transactionManager_)
-    } else {
-      const temp = this.manager_
-      const doWork = async (m: EntityManager): Promise<unknown | never> => {
-        this.manager_ = m
-        this.transactionManager_ = m
-        try {
-          const result = await work(m)
-          this.manager_ = temp
-          this.transactionManager_ = undefined
-          return result
-        } catch (error) {
-          this.manager_ = temp
-          this.transactionManager_ = undefined
-          throw error
-        }
-      }
-
-      if (isolation) {
-        let result
-        try {
-          result = await this.manager_.transaction(
-            isolation as IsolationLevel,
-            (m) => doWork(m)
-          )
-          return result
-        } catch (error) {
-          if (this.shouldRetryTransaction(error)) {
-            return this.manager_.transaction(isolation as IsolationLevel, (m) =>
-              doWork(m)
-            )
-          } else {
-            if (errorHandler) {
-              await errorHandler(error)
-            }
-            throw error
-          }
-        }
-      }
-
-      try {
-        return await this.manager_.transaction((m) => doWork(m))
-      } catch (error) {
-        if (errorHandler) {
-          const result = await errorHandler(error)
-          if (dontFail) {
-            return result
-          }
-        }
-
-        throw error
-      }
-    }
-  }
-
-  /**
-   * Dedicated method to set metadata.
-   * @param obj - the entity to apply metadata to.
-   * @param metadata - the metadata to set
-   * @return resolves to the updated result.
-   */
-  setMetadata_(
-    obj: { metadata: Record<string, unknown> },
-    metadata: Record<string, unknown>
-  ): Record<string, unknown> {
-    const existing = obj.metadata || {}
-    const newData = {}
-    for (const [key, value] of Object.entries(metadata)) {
-      if (typeof key !== "string") {
-        throw new MedusaError(
-          MedusaError.Types.INVALID_ARGUMENT,
-          "Key type is invalid. Metadata keys must be strings"
-        )
-      }
-      newData[key] = value
-    }
-
-    return {
-      ...existing,
-      ...newData,
-    }
-  }
-}
-export default BaseService
diff --git a/packages/medusa/src/interfaces/index.ts b/packages/medusa/src/interfaces/index.ts
index 7552d3c149..9472f26f30 100644
--- a/packages/medusa/src/interfaces/index.ts
+++ b/packages/medusa/src/interfaces/index.ts
@@ -1,4 +1,4 @@
 export * from "./tax-calculation-strategy"
 export * from "./cart-completion-strategy"
 export * from "./tax-service"
-export * from "./base-service"
+export * from "./transaction-base-service"
diff --git a/packages/medusa/src/interfaces/transaction-base-service.ts b/packages/medusa/src/interfaces/transaction-base-service.ts
new file mode 100644
index 0000000000..96d472bb23
--- /dev/null
+++ b/packages/medusa/src/interfaces/transaction-base-service.ts
@@ -0,0 +1,149 @@
+import { EntityManager } from "typeorm"
+import { IsolationLevel } from "typeorm/driver/types/IsolationLevel"
+
+export abstract class TransactionBaseService<
+  TChild extends TransactionBaseService<TChild, TContainer>,
+  TContainer = unknown
+> {
+  protected abstract manager_: EntityManager
+  protected abstract transactionManager_: EntityManager | undefined
+
+  protected constructor(
+    protected readonly container: TContainer,
+    protected readonly configModule?: Record<string, unknown>
+  ) {}
+
+  withTransaction(transactionManager?: EntityManager): this | TChild {
+    if (!transactionManager) {
+      return this
+    }
+
+    const cloned = new (<any>this.constructor)(
+      {
+        ...this.container,
+        manager: transactionManager,
+      },
+      this.configModule
+    )
+
+    cloned.transactionManager_ = transactionManager
+
+    return cloned as TChild
+  }
+
+  protected shouldRetryTransaction_(
+    err: { code: string } | Record<string, unknown>
+  ): boolean {
+    if (!(err as { code: string })?.code) {
+      return false
+    }
+    const code = (err as { code: string })?.code
+    return code === "40001" || code === "40P01"
+  }
+
+  /**
+   * Wraps some work within a transactional block. If the service already has
+   * a transaction manager attached this will be reused, otherwise a new
+   * transaction manager is created.
+   * @param work - the transactional work to be done
+   * @param isolationOrErrorHandler - the isolation level to be used for the work.
+   * @param maybeErrorHandlerOrDontFail Potential error handler
+   * @return the result of the transactional work
+   */
+  protected async atomicPhase_<TResult, TError>(
+    work: (transactionManager: EntityManager) => Promise<TResult | never>,
+    isolationOrErrorHandler?:
+      | IsolationLevel
+      | ((error: TError) => Promise<never | TResult | void>),
+    maybeErrorHandlerOrDontFail?: (
+      error: TError
+    ) => Promise<never | TResult | void>
+  ): Promise<never | TResult> {
+    let errorHandler = maybeErrorHandlerOrDontFail
+    let isolation:
+      | IsolationLevel
+      | ((error: TError) => Promise<never | TResult | void>)
+      | undefined
+      | null = isolationOrErrorHandler
+    let dontFail = false
+    if (typeof isolationOrErrorHandler === "function") {
+      isolation = null
+      errorHandler = isolationOrErrorHandler
+      dontFail = !!maybeErrorHandlerOrDontFail
+    }
+
+    if (this.transactionManager_) {
+      const doWork = async (m: EntityManager): Promise<never | TResult> => {
+        this.manager_ = m
+        this.transactionManager_ = m
+        try {
+          return await work(m)
+        } catch (error) {
+          if (errorHandler) {
+            const queryRunner = this.transactionManager_.queryRunner
+            if (queryRunner && queryRunner.isTransactionActive) {
+              await queryRunner.rollbackTransaction()
+            }
+
+            await errorHandler(error)
+          }
+          throw error
+        }
+      }
+
+      return await doWork(this.transactionManager_)
+    } else {
+      const temp = this.manager_
+      const doWork = async (m: EntityManager): Promise<never | TResult> => {
+        this.manager_ = m
+        this.transactionManager_ = m
+        try {
+          const result = await work(m)
+          this.manager_ = temp
+          this.transactionManager_ = undefined
+          return result
+        } catch (error) {
+          this.manager_ = temp
+          this.transactionManager_ = undefined
+          throw error
+        }
+      }
+
+      if (isolation && this.manager_) {
+        let result
+        try {
+          result = await this.manager_.transaction(
+            isolation as IsolationLevel,
+            (m) => doWork(m)
+          )
+          return result
+        } catch (error) {
+          if (this.shouldRetryTransaction_(error)) {
+            return this.manager_.transaction(
+              isolation as IsolationLevel,
+              (m): Promise<never | TResult> => doWork(m)
+            )
+          } else {
+            if (errorHandler) {
+              await errorHandler(error)
+            }
+            throw error
+          }
+        }
+      }
+
+      try {
+        return await this.manager_.transaction((m) => doWork(m))
+      } catch (error) {
+        if (errorHandler) {
+          const result = await errorHandler(error)
+          if (dontFail) {
+            return result as TResult
+          }
+        }
+
+        throw error
+      }
+    }
+  }
+}
diff --git a/packages/medusa/src/services/cart.ts b/packages/medusa/src/services/cart.ts
index 6e5d0c4284..69973d4371 100644
--- a/packages/medusa/src/services/cart.ts
+++ b/packages/medusa/src/services/cart.ts
@@ -1,6 +1,5 @@
 import _ from "lodash"
 import { MedusaError, Validator } from "medusa-core-utils"
-import { BaseService } from "medusa-interfaces"
 import { DeepPartial, EntityManager, In } from "typeorm"
 import { IPriceSelectionStrategy } from "../interfaces/price-selection-strategy"
 import { Address } from "../models/address"
@@ -37,6 +36,8 @@ import InventoryService from "./inventory"
 import CustomShippingOptionService from "./custom-shipping-option"
 import LineItemAdjustmentService from "./line-item-adjustment"
 import { LineItemRepository } from "../repositories/line-item"
+import { TransactionBaseService } from "../interfaces"
+import { buildQuery, setMetadata, validateId } from "../utils"
 
 type InjectedDependencies = {
   manager: EntityManager
@@ -70,14 +71,16 @@ type TotalsConfig = {
 /* Provides layer to manipulate carts.
  * @implements BaseService
  */
-class CartService extends BaseService {
-  static Events = {
+class CartService extends TransactionBaseService<CartService> {
+  static readonly Events = {
     CUSTOMER_UPDATED: "cart.customer_updated",
     CREATED: "cart.created",
     UPDATED: "cart.updated",
   }
 
-  protected readonly manager_: EntityManager
+  protected manager_: EntityManager
+  protected transactionManager_: EntityManager | undefined
+
   protected readonly shippingMethodRepository_: typeof ShippingMethodRepository
   protected readonly cartRepository_: typeof CartRepository
   protected readonly addressRepository_: typeof AddressRepository
@@ -124,7 +127,8 @@ class CartService extends BaseService {
     lineItemAdjustmentService,
     priceSelectionStrategy,
   }: InjectedDependencies) {
-    super()
+    // eslint-disable-next-line prefer-rest-params
+    super(arguments[0])
 
     this.manager_ = manager
     this.shippingMethodRepository_ = shippingMethodRepository
@@ -150,41 +154,6 @@ class CartService extends BaseService {
     this.priceSelectionStrategy_ = priceSelectionStrategy
   }
 
-  withTransaction(transactionManager: EntityManager): CartService {
-    if (!transactionManager) {
-      return this
-    }
-
-    const cloned = new CartService({
-      manager: transactionManager,
-      taxProviderService: this.taxProviderService_,
-      cartRepository: this.cartRepository_,
-      lineItemRepository: this.lineItemRepository_,
-      eventBusService: this.eventBus_,
-      paymentProviderService: this.paymentProviderService_,
-      paymentSessionRepository: this.paymentSessionRepository_,
-      shippingMethodRepository: this.shippingMethodRepository_,
-      productService: this.productService_,
-      productVariantService: this.productVariantService_,
-      regionService: this.regionService_,
-      lineItemService: this.lineItemService_,
-      shippingOptionService: this.shippingOptionService_,
-      customerService: this.customerService_,
-      discountService: this.discountService_,
-      totalsService: this.totalsService_,
-      addressRepository: this.addressRepository_,
-      giftCardService: this.giftCardService_,
-      inventoryService: this.inventoryService_,
-      customShippingOptionService: this.customShippingOptionService_,
-      lineItemAdjustmentService: this.lineItemAdjustmentService_,
-      priceSelectionStrategy: this.priceSelectionStrategy_,
-    })
-
-    cloned.transactionManager_ = transactionManager
-
-    return cloned
-  }
-
   protected transformQueryForTotals_(
     config: FindConfig<Cart>
   ): FindConfig<Cart> & { totalsToSelect: TotalField[] } {
@@ -292,7 +261,7 @@ class CartService extends BaseService {
           this.cartRepository_
         )
 
-        const query = this.buildQuery_(selector, config)
+        const query = buildQuery<Cart>(selector, config)
         return await cartRepo.find(query)
       }
     )
@@ -315,12 +284,12 @@ class CartService extends BaseService {
         const cartRepo = transactionManager.getCustomRepository(
           this.cartRepository_
         )
-        const validatedId = this.validateId_(cartId)
+        const validatedId = validateId(cartId)
 
         const { select, relations, totalsToSelect } =
           this.transformQueryForTotals_(options)
 
-        const query = this.buildQuery_(
+        const query = buildQuery<Cart>(
           { id: validatedId },
           { ...options, select, relations }
         )
@@ -714,16 +683,20 @@ class CartService extends BaseService {
    * @param shouldAdd - flag to indicate, if we should add or remove
    * @return void
    */
-  async adjustFreeShipping_(cart: Cart, shouldAdd: boolean): Promise<void> {
+  protected async adjustFreeShipping_(
+    cart: Cart,
+    shouldAdd: boolean
+  ): Promise<void> {
+    const transactionManager = this.transactionManager_ ?? this.manager_
+
     if (cart.shipping_methods?.length) {
-      const shippingMethodRepository =
-        this.transactionManager_.getCustomRepository(
-          this.shippingMethodRepository_
-        )
+      const shippingMethodRepository = transactionManager.getCustomRepository(
+        this.shippingMethodRepository_
+      )
 
       // if any free shipping discounts, we ensure to update shipping method amount
       if (shouldAdd) {
-        return shippingMethodRepository.update(
+        await shippingMethodRepository.update(
           {
             id: In(
               cart.shipping_methods.map((shippingMethod) => shippingMethod.id)
@@ -855,8 +828,8 @@ class CartService extends BaseService {
           )
         }
 
-        if ("metadata" in data) {
-          cart.metadata = this.setMetadata_(cart, data.metadata)
+        if (data?.metadata) {
+          cart.metadata = setMetadata(cart, data.metadata)
         }
 
         if ("context" in data) {
@@ -1352,7 +1325,7 @@ class CartService extends BaseService {
    * @param cartOrCartId - the id of the cart to set payment session for
    * @return the result of the update operation.
    */
-  async setPaymentSessions(cartOrCartId: Cart | string): Promise<Cart> {
+  async setPaymentSessions(cartOrCartId: Cart | string): Promise<void> {
     return await this.atomicPhase_(
       async (transactionManager: EntityManager) => {
         const psRepo = transactionManager.getCustomRepository(
@@ -1679,6 +1652,8 @@ class CartService extends BaseService {
     regionId?: string,
     customer_id?: string
   ): Promise<void> {
+    const transactionManager = this.transactionManager_ ?? this.manager_
+
     // If the cart contains items, we update the price of the items
     // to match the updated region or customer id (keeping the old
     // value if it exists)
@@ -1693,7 +1668,7 @@ class CartService extends BaseService {
         await Promise.all(
           cart.items.map(async (item) => {
             const availablePrice = await this.priceSelectionStrategy_
-              .withTransaction(this.transactionManager_)
+              .withTransaction(transactionManager)
               .calculateVariantPrice(item.variant_id, {
                 region_id: region.id,
                 currency_code: region.currency_code,
@@ -1708,14 +1683,14 @@ class CartService extends BaseService {
               availablePrice.calculatedPrice !== null
             ) {
               return this.lineItemService_
-                .withTransaction(this.transactionManager_)
+                .withTransaction(transactionManager)
                 .update(item.id, {
                   has_shipping: false,
                   unit_price: availablePrice.calculatedPrice,
                 })
             } else {
               await this.lineItemService_
-                .withTransaction(this.transactionManager_)
+                .withTransaction(transactionManager)
                 .delete(item.id)
               return
             }
@@ -1737,6 +1712,8 @@ class CartService extends BaseService {
     regionId: string,
     countryCode: string | null
   ): Promise<void> {
+    const transactionManager = this.transactionManager_ ?? this.manager_
+
     if (cart.completed_at || cart.payment_authorized_at) {
       throw new MedusaError(
         MedusaError.Types.NOT_ALLOWED,
@@ -1750,7 +1727,7 @@ class CartService extends BaseService {
       .retrieve(regionId, {
         relations: ["countries"],
       })
-    const addrRepo = this.transactionManager_.getCustomRepository(
+    const addrRepo = transactionManager.getCustomRepository(
       this.addressRepository_
     )
     cart.region = region
@@ -1828,7 +1805,7 @@ class CartService extends BaseService {
     // new shipping method
     if (cart.shipping_methods && cart.shipping_methods.length) {
       await this.shippingOptionService_
-        .withTransaction(this.transactionManager_)
+        .withTransaction(transactionManager)
         .deleteShippingMethods(cart.shipping_methods)
     }
 
@@ -1841,7 +1818,7 @@ class CartService extends BaseService {
     cart.gift_cards = []
 
     if (cart.payment_sessions && cart.payment_sessions.length) {
-      const paymentSessionRepo = this.transactionManager_.getCustomRepository(
+      const paymentSessionRepo = transactionManager.getCustomRepository(
         this.paymentSessionRepository_
       )
       await paymentSessionRepo.delete({
@@ -1859,7 +1836,7 @@ class CartService extends BaseService {
    * @param cartId - the id of the cart to delete
    * @return the deleted cart or undefined if the cart was not found.
    */
-  async delete(cartId: string): Promise<string> {
+  async delete(cartId: string): Promise<Cart> {
     return await this.atomicPhase_(
       async (transactionManager: EntityManager) => {
         const cart = await this.retrieve(cartId, {
@@ -1913,7 +1890,7 @@ class CartService extends BaseService {
           this.cartRepository_
         )
 
-        const validatedId = this.validateId_(cartId)
+        const validatedId = validateId(cartId)
         if (typeof key !== "string") {
           throw new MedusaError(
             MedusaError.Types.INVALID_ARGUMENT,
@@ -1972,20 +1949,22 @@ class CartService extends BaseService {
   }
 
   protected async refreshAdjustments_(cart: Cart): Promise<void> {
+    const transactionManager = this.transactionManager_ ?? this.manager_
+
     const nonReturnLineIDs = cart.items
       .filter((item) => !item.is_return)
       .map((i) => i.id)
 
     // delete all old non return line item adjustments
     await this.lineItemAdjustmentService_
-      .withTransaction(this.transactionManager_)
+      .withTransaction(transactionManager)
       .delete({
         item_id: nonReturnLineIDs,
       })
 
     // potentially create/update line item adjustments
     await this.lineItemAdjustmentService_
-      .withTransaction(this.transactionManager_)
+      .withTransaction(transactionManager)
       .createAdjustments(cart)
   }
 
@@ -2001,7 +1980,7 @@ class CartService extends BaseService {
         const cartRepo = transactionManager.getCustomRepository(
           this.cartRepository_
         )
-        const validatedId = this.validateId_(cartId)
+        const validatedId = validateId(cartId)
 
         if (typeof key !== "string") {
           throw new MedusaError(
diff --git a/packages/medusa/src/types/cart.ts b/packages/medusa/src/types/cart.ts
index 249c0c9af0..dfba20b82f 100644
--- a/packages/medusa/src/types/cart.ts
+++ b/packages/medusa/src/types/cart.ts
@@ -71,5 +71,5 @@ export type CartUpdateProps = {
   discounts?: Discount[]
   customer_id?: string
   context?: object
-  metadata?: object
+  metadata?: Record<string, unknown>
 }
diff --git a/packages/medusa/src/types/common.ts b/packages/medusa/src/types/common.ts
index 98bd6fde7d..da52f14025 100644
--- a/packages/medusa/src/types/common.ts
+++ b/packages/medusa/src/types/common.ts
@@ -13,6 +13,22 @@ export type PartialPick<T, K extends keyof T> = {
   [P in K]?: T[P]
 }
 
+export type Writable<T> = { -readonly [key in keyof T]: T[key] }
+
+export type ExtendedFindConfig<TEntity> = FindConfig<TEntity> & {
+  where: Partial<Writable<TEntity>>
+  withDeleted?: boolean
+}
+
+export type Selector<TEntity> = {
+  [key in keyof TEntity]?:
+    | TEntity[key]
+    | TEntity[key][]
+    | DateComparisonOperator
+    | StringComparisonOperator
+    | NumericalComparisonOperator
+}
+
 export type TotalField =
   | "shipping_total"
   | "discount_total"
diff --git a/packages/medusa/src/utils/__tests__/build-query.spec.ts b/packages/medusa/src/utils/__tests__/build-query.spec.ts
new file mode 100644
index 0000000000..f9a4819390
--- /dev/null
+++ b/packages/medusa/src/utils/__tests__/build-query.spec.ts
@@ -0,0 +1,28 @@
+import { In, Not } from "typeorm"
+import { buildQuery } from "../build-query"
+
+describe('buildQuery', () => {
+  describe("buildQuery_", () => {
+    it("successfully creates query", () => {
+      const q = buildQuery(
+        {
+          id: "1234",
+          test1: ["123", "12", "1"],
+          test2: Not("this"),
+        },
+        {
+          relations: ["1234"],
+        }
+      )
+
+      expect(q).toEqual({
+        where: {
+          id: "1234",
+          test1: In(["123", "12", "1"]),
+          test2: Not("this"),
+        },
+        relations: ["1234"],
+      })
+    })
+  })
+})
\ No newline at end of file
diff --git a/packages/medusa/src/utils/build-query.ts b/packages/medusa/src/utils/build-query.ts
new file mode 100644
index 0000000000..f61123741d
--- /dev/null
+++ b/packages/medusa/src/utils/build-query.ts
@@ -0,0 +1,113 @@
+import {
+  ExtendedFindConfig,
+  FindConfig,
+  Selector,
+  Writable,
+} from "../types/common"
+import { FindOperator, In, Raw } from "typeorm"
+
+/**
+* Used to build TypeORM queries.
+* @param selector The selector
+* @param config The config
+* @return The QueryBuilderConfig
+*/
+export function buildQuery<TEntity = unknown>(
+  selector: Selector<TEntity>,
+  config: FindConfig<TEntity> = {}
+): ExtendedFindConfig<TEntity> {
+  const build = (
+    obj: Selector<TEntity>
+  ): Partial<Writable<TEntity>> => {
+    return Object.entries(obj).reduce((acc, [key, value]: any) => {
+      // Undefined values indicate that they have no significance to the query.
+      // If the query is looking for rows where a column is not set it should use null instead of undefined
+      if (typeof value === "undefined") {
+        return acc
+      }
+
+      const subquery: {
+        operator: "<" | ">" | "<=" | ">="
+        value: unknown
+      }[] = []
+
+      switch (true) {
+        case value instanceof FindOperator:
+          acc[key] = value
+          break
+        case Array.isArray(value):
+          acc[key] = In([...(value as unknown[])])
+          break
+        case value !== null && typeof value === "object":
+          Object.entries(value).map(([modifier, val]) => {
+            switch (modifier) {
+              case "lt":
+                subquery.push({ operator: "<", value: val })
+                break
+              case "gt":
+                subquery.push({ operator: ">", value: val })
+                break
+              case "lte":
+                subquery.push({ operator: "<=", value: val })
+                break
+              case "gte":
+                subquery.push({ operator: ">=", value: val })
+                break
+              default:
+                acc[key] = value
+                break
+            }
+          })
+
+          if (subquery.length) {
+            acc[key] = Raw(
+              (a) =>
+                subquery
+                  .map((s, index) => `${a} ${s.operator} :${index}`)
+                  .join(" AND "),
+              subquery.map((s) => s.value)
+            )
+          }
+          break
+        default:
+          acc[key] = value
+          break
+      }
+
+      return acc
+    }, {} as Partial<Writable<TEntity>>)
+  }
+
+  const query: FindConfig<TEntity> & {
+    where: Partial<Writable<TEntity>>
+    withDeleted?: boolean
+  } = {
+    where: build(selector),
+  }
+
+  if ("deleted_at" in selector) {
+    query.withDeleted = true
+  }
+
+  if ("skip" in config) {
+    query.skip = config.skip
+  }
+
+  if ("take" in config) {
+    query.take = config.take
+  }
+
+  if ("relations" in config) {
+    query.relations = config.relations
+  }
+
+  if ("select" in config) {
+    query.select = config.select
+  }
+
+  if ("order" in config) {
+    query.order = config.order
+  }
+
+  return query
+}
\ No newline at end of file
diff --git a/packages/medusa/src/utils/index.ts b/packages/medusa/src/utils/index.ts
new file mode 100644
index 0000000000..5d7ec9889f
--- /dev/null
+++ b/packages/medusa/src/utils/index.ts
@@ -0,0 +1,3 @@
+export * from './build-query'
+export * from './set-metadata'
+export * from './validate-id'
\ No newline at end of file
diff --git a/packages/medusa/src/utils/set-metadata.ts b/packages/medusa/src/utils/set-metadata.ts
new file mode 100644
index 0000000000..d27cddc5ed
--- /dev/null
+++ b/packages/medusa/src/utils/set-metadata.ts
@@ -0,0 +1,29 @@
+import { MedusaError } from "medusa-core-utils/dist"
+
+/**
+* Dedicated method to set metadata.
+* @param obj - the entity to apply metadata to.
+* @param metadata - the metadata to set
+* @return resolves to the updated result.
+*/
+export function setMetadata(
+  obj: { metadata: Record<string, unknown> },
+  metadata: Record<string, unknown>
+): Record<string, unknown> {
+  const existing = obj.metadata || {}
+  const newData = {}
+  for (const [key, value] of Object.entries(metadata)) {
+    if (typeof key !== "string") {
+      throw new MedusaError(
+        MedusaError.Types.INVALID_ARGUMENT,
+        "Key type is invalid. Metadata keys must be strings"
+      )
+    }
+    newData[key] = value
+  }
+
+  return {
+    ...existing,
+    ...newData,
+  }
+}
\ No newline at end of file
diff --git a/packages/medusa/src/utils/validate-id.ts b/packages/medusa/src/utils/validate-id.ts
new file mode 100644
index 0000000000..da6102e69a
--- /dev/null
+++ b/packages/medusa/src/utils/validate-id.ts
@@ -0,0 +1,41 @@
+/**
+* Confirms whether a given raw id is valid. Fails if the provided
+* id is null or undefined. The validate function takes an optional config
+* param, to support checking id prefix and length.
+* @param rawId - the id to validate.
+* @param config - optional config
+* @returns the rawId given that nothing failed
+*/
+import { MedusaError } from "medusa-core-utils/dist"
+
+export function validateId(
+  rawId: string,
+  config: { prefix?: string; length?: number } = {}
+): string {
+  const { prefix, length } = config
+  if (!rawId) {
+    throw new MedusaError(
+      MedusaError.Types.INVALID_DATA,
+      `Failed to validate id: ${rawId}`
+    )
+  }
+
+  if (prefix || length) {
+    const [pre, rand] = rawId.split("_")
+    if (prefix && pre !== prefix) {
+      throw new MedusaError(
+        MedusaError.Types.INVALID_DATA,
+        `The provided id: ${rawId} does not adhere to prefix constraint: ${prefix}`
+      )
+    }
+
+    if (length && length !== rand.length) {
+      throw new MedusaError(
+        MedusaError.Types.INVALID_DATA,
+        `The provided id: ${rawId} does not adhere to length constraint: ${length}`
+      )
+    }
+  }
+
+  return rawId
+}
\ No newline at end of file