fix: account for lowest currency unit in paypal (#761)

* fix: account for lowest currency unit in paypal

* fix: currency rounding

packages/medusa-payment-paypal/src/services/paypal-provider.js

@@ -1,7 +1,15 @@
 import _ from "lodash"
+import { humanizeAmount, zeroDecimalCurrencies } from "medusa-core-utils"
 import PayPal from "@paypal/checkout-server-sdk"
 import { PaymentService } from "medusa-interfaces"
 
+function roundToTwo(num, currency) {
+  if (zeroDecimalCurrencies.includes(currency.toLowerCase())) {
+    return `${num}`
+  }
+  return num.toFixed(2)
+}
+
 class PayPalProviderService extends PaymentService {
   static identifier = "paypal"
 
@@ -101,7 +109,10 @@ class PayPalProviderService extends PaymentService {
           custom_id: cart.id,
           amount: {
             currency_code: currency_code.toUpperCase(),
-            value: (amount / 100).toFixed(2),
+            value: roundToTwo(
+              humanizeAmount(amount, currency_code),
+              currency_code
+            ),
           },
         },
       ],
@@ -193,7 +204,10 @@ class PayPalProviderService extends PaymentService {
           value: {
             amount: {
               currency_code: currency_code.toUpperCase(),
-              value: (cart.total / 100).toFixed(2),
+              value: roundToTwo(
+                humanizeAmount(cart.total, currency_code),
+                currency_code
+              ),
             },
           },
         },
@@ -254,7 +268,10 @@ class PayPalProviderService extends PaymentService {
       request.requestBody({
         amount: {
           currency_code: payment.currency_code.toUpperCase(),
-          value: (amountToRefund / 100).toFixed(2),
+          value: roundToTwo(
+            humanizeAmount(amountToRefund, payment.currency_code),
+            payment.currency_code
+          ),
         },
       })