[bug] zero-decimal currencies w/ stripe

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 - Updated ffi to 1.15.1
 - Updated GitHub issue templates
+- Fix a bug: zero-decimal currencies were charged multiplied by 100
 - Fix a bug: fablab:fix_invoices task fails to recreate the data if the date is in english
 
 ## v4.7.10 2021 May 25

app/controllers/api/payments_controller.rb

@@ -26,7 +26,7 @@ class API::PaymentsController < API::ApiController
         intent = Stripe::PaymentIntent.create(
           {
             payment_method: params[:payment_method_id],
-            amount: amount[:amount],
+            amount: StripeService.stripe_amount(amount[:amount]),
             currency: Setting.get('stripe_currency'),
             confirmation_method: 'manual',
             confirm: true,

app/services/stripe_service.rb

@@ -50,7 +50,7 @@ class StripeService
       if coupon.type == 'percent_off'
         stp_coupon[:percent_off] = coupon.percent_off
       elsif coupon.type == 'amount_off'
-        stp_coupon[:amount_off] = coupon.amount_off
+        stp_coupon[:amount_off] = stripe_amount(coupon.amount_off)
         stp_coupon[:currency] = Setting.get('stripe_currency')
       end
 
@@ -61,6 +61,13 @@ class StripeService
       Stripe::Coupon.create(stp_coupon, api_key: Setting.get('stripe_secret_key'))
     end
 
+    def stripe_amount(amount)
+      currency = Setting.get('stripe_currency')
+      return amount / 100 if zero_decimal_currencies.any? { |s| s.casecmp(currency).zero? }
+
+      amount
+    end
+
     private
 
     def subscription_invoice_items(payment_schedule, subscription, first_item, reservable_stp_id)
@@ -91,7 +98,7 @@ class StripeService
 
     def create_price(amount, stp_product_id, name, monthly: false)
       params = {
-        unit_amount: amount,
+        unit_amount: stripe_amount(amount),
         currency: Setting.get('stripe_currency'),
         product: stp_product_id,
         nickname: name
@@ -107,5 +114,10 @@ class StripeService
       customer_id = payment_schedule.invoicing_profile.user.stp_customer_id
       Stripe::Customer.update(customer_id, { balance: -payment_schedule.wallet_amount }, { api_key: Setting.get('stripe_secret_key') })
     end
+
+    # @see https://stripe.com/docs/currencies#zero-decimal
+    def zero_decimal_currencies
+      %w[BIF CLP DJF GNF JPY KMF KRW MGA PYG RWF UGX VND VUV XAF XOF XPF]
+    end
   end
 end