Initial work on economic plugin

packages/medusa-plugin-economic/.babelrc

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+{
+  "plugins": [
+    "@babel/plugin-proposal-class-properties",
+    "@babel/plugin-transform-instanceof",
+    "@babel/plugin-transform-classes"
+  ],
+  "presets": ["@babel/preset-env"],
+  "env": {
+    "test": {
+      "plugins": ["@babel/plugin-transform-runtime"]
+    }
+  }
+}

packages/medusa-plugin-economic/.eslintrc

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+{
+  "plugins": ["prettier"],
+  "extends": ["prettier"],
+  "rules": {
+    "prettier/prettier": "error",
+    "semi": "error",
+    "no-unused-expressions": "true"
+  }
+}

packages/medusa-plugin-economic/.gitignore

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+/lib
+node_modules
+.DS_store
+.env*
+/*.js
+!index.js
+!jest.config.js
+
+/dist
+
+/api
+/services
+/models
+/subscribers
+

packages/medusa-plugin-economic/.npmignore

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+/lib
+node_modules
+.DS_store
+.env*
+/*.js
+!index.js
+yarn.lock
+
+

packages/medusa-plugin-economic/.prettierrc

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+{
+  "endOfLine": "lf",
+  "semi": false,
+  "singleQuote": false,
+  "tabWidth": 2,
+  "trailingComma": "es5"
+}

packages/medusa-plugin-economic/index.js

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+// noop

packages/medusa-plugin-economic/jest.config.js

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+module.exports = {
+  testEnvironment: "node",
+}

packages/medusa-plugin-economic/package.json

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+{
+  "name": "medusa-plugin-economic",
+  "version": "1.0.0",
+  "description": "E-conomic financial reporting",
+  "main": "index.js",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/medusajs/medusa",
+    "directory": "packages/medusa-plugin-economic"
+  },
+  "author": "Oliver Juhl",
+  "license": "AGPL-3.0-or-later",
+  "devDependencies": {
+    "@babel/cli": "^7.7.5",
+    "@babel/core": "^7.7.5",
+    "@babel/node": "^7.7.4",
+    "@babel/plugin-proposal-class-properties": "^7.7.4",
+    "@babel/plugin-transform-instanceof": "^7.8.3",
+    "@babel/plugin-transform-runtime": "^7.7.6",
+    "@babel/preset-env": "^7.7.5",
+    "@babel/register": "^7.7.4",
+    "@babel/runtime": "^7.9.6",
+    "client-sessions": "^0.8.0",
+    "cross-env": "^5.2.1",
+    "eslint": "^6.8.0",
+    "jest": "^25.5.2"
+  },
+  "scripts": {
+    "build": "babel src -d .",
+    "prepare": "cross-env NODE_ENV=production npm run build",
+    "watch": "babel -w src --out-dir . --ignore **/__tests__",
+    "test": "jest"
+  },
+  "dependencies": {
+    "@babel/plugin-transform-classes": "^7.9.5",
+    "axios": "^0.19.2",
+    "body-parser": "^1.19.0",
+    "express": "^4.17.1",
+    "medusa-core-utils": "^0.3.0",
+    "medusa-interfaces": "^0.3.0",
+    "medusa-test-utils": "^0.3.0"
+  }
+}

packages/medusa-plugin-economic/src/services/economic.js

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+import axios from "axios"
+import moment from "moment"
+import { BaseService } from "medusa-interfaces"
+
+ECONOMIC_BASE_URL = "https://restapi.e-conomic.com"
+
+class EconomicService extends BaseService {
+  /**
+   * @param {Object} options - options defined in `medusa-config.js`
+   *    {
+   *      secret_token: "foo",
+   *      agreement_token: "bar",
+   *      customer_number_dk: 012
+   *      customer_number_eu: 345
+   *      customer_number_world: 678,
+   *      vat_number: 42,
+   *      unit_number: 42,
+   *      payment_terms_number: 42,
+   *      shipping_product_number: 42,
+   *      layout_number: 42
+   *    }
+   */
+  constructor({ orderService, totalsService, regionService }, options) {
+    super()
+
+    this.orderService_ = orderService
+
+    this.totalsService_ = totalsService
+
+    this.regionService_ = regionService
+
+    this.options_ = options
+
+    this.economic_ = axios.create({
+      baseURL: ECONOMIC_BASE_URL,
+      headers: {
+        "X-AppSecretToken": options.secret_token,
+        "X-AgreementGrantToken": options.agreement_token,
+      },
+    })
+  }
+
+  async createEconomicLinesFromOrder(order) {
+    let order_lines = []
+    // Find the discount, that is not free shipping
+    const discount = order.discounts.find(
+      ({ discount_rule }) => discount_rule.type !== "free_shipping"
+    )
+    // If the discount has an item specific allocation method,
+    // we need to fetch the discount for each item
+    const itemDiscounts = await this.totalsService_.getAllocationItemDiscounts(
+      discount,
+      order
+    )
+
+    order.items.forEach((item) => {
+      // For bundles, we create an order line for each item in the bundle
+      if (Array.isArray(item.content)) {
+        item.content.forEach((c) => {
+          const total_amount = c.unit_price * c.quantity * (taxRate + 1)
+
+          order_lines.push({
+            lineNumber: order_lines.length + 1,
+            sortKey: 1,
+            unit: {
+              unitNumber: 1,
+            },
+            product: {
+              productNumber: c.product.sku,
+            },
+            quantity: c.quantity,
+            // Do we include taxes on this bad boy?
+            unitNetPrice: total_amount,
+          })
+        })
+      } else {
+        const total_amount = item.content.unit_price * item.content.quantity
+
+        // Find the discount for current item and default to 0
+        const itemDiscount =
+          (itemDiscounts &&
+            itemDiscounts.find((el) => el.lineItem._id === item._id)) ||
+          0
+
+        // Withdraw discount from the total item amount
+        const total_discount_amount = total_amount - itemDiscount
+
+        order_lines.push({
+          lineNumber: order_lines.length + 1,
+          sortKey: 1,
+          unit: {
+            unitNumber: 1,
+          },
+          product: {
+            productNumber: item.content.product.sku,
+          },
+          quantity: item.content.quantity,
+          // Do we include taxes on this bad boy?
+          unitNetPrice: total_discount_amount,
+        })
+      }
+    })
+  }
+
+  async createInvoiceFromOrder(order, lineItems) {
+    // Fetch currency code from order region
+    const { currency_code } = await this.regionService_.retrieve(
+      order.region_id
+    )
+
+    const invoice = {
+      date: moment().format("YYYY-MM-DD"),
+      currency: currency_code,
+      paymentTerms: {
+        paymentTermsNumber: 14,
+      },
+      references: {
+        other: order._id,
+      },
+      customer: {
+        customerNumber,
+      },
+      recipient: {
+        name: "Webshop Customer",
+        vatZone: {
+          vatZoneNumber,
+        },
+      },
+      layout: {
+        layoutNumber: 19,
+      },
+      lines,
+    }
+  }
+
+  async draftEconomicInvoice(orderId) {
+    const order = await this.orderService_.retrieve(orderId)
+  }
+}
+
+export default EconomicService