feat: use same customer record for recurring transactions (#63)

Author: zcesur

lib/algora/bounties/bounties.ex

@@ -736,9 +736,7 @@ defmodule Algora.Bounties do
                group_id: tx_group_id
              }),
            {:ok, session} <-
-             line_items
-             |> Enum.map(&LineItem.to_stripe/1)
-             |> Payments.create_stripe_session(%{
+             Payments.create_stripe_session(owner, Enum.map(line_items, &LineItem.to_stripe/1), %{
                description: description,
                metadata: %{"version" => Payments.metadata_version(), "group_id" => tx_group_id}
              }) do

lib/algora/payments/payments.ex

@@ -28,20 +28,24 @@ defmodule Algora.Payments do
   end
 
   @spec create_stripe_session(
+          user :: User.t(),
           line_items :: [PSP.Session.line_item_data()],
           payment_intent_data :: PSP.Session.payment_intent_data()
         ) ::
           {:ok, PSP.session()} | {:error, PSP.error()}
-  def create_stripe_session(line_items, payment_intent_data) do
-    PSP.Session.create(%{
-      mode: "payment",
-      billing_address_collection: "required",
-      line_items: line_items,
-      invoice_creation: %{enabled: true},
-      success_url: "#{AlgoraWeb.Endpoint.url()}/payment/success",
-      cancel_url: "#{AlgoraWeb.Endpoint.url()}/payment/canceled",
-      payment_intent_data: payment_intent_data
-    })
+  def create_stripe_session(user, line_items, payment_intent_data) do
+    with {:ok, customer} <- fetch_or_create_customer(user) do
+      PSP.Session.create(%{
+        mode: "payment",
+        customer: customer.provider_id,
+        billing_address_collection: "required",
+        line_items: line_items,
+        invoice_creation: %{enabled: true},
+        success_url: "#{AlgoraWeb.Endpoint.url()}/payment/success",
+        cancel_url: "#{AlgoraWeb.Endpoint.url()}/payment/canceled",
+        payment_intent_data: payment_intent_data
+      })
+    end
   end
 
   def get_transaction_fee_pct, do: Decimal.new("0.04")

test/support/factory.ex

@@ -252,7 +252,14 @@ defmodule Algora.Factory do
   end
 
   # Convenience API
-  def insert!(factory_name, attributes \\ []) do
+  def insert!(factory_name, attributes \\ [])
+
+  def insert!(factory_name, attributes) when factory_name in [:user, :organization] do
+    user = insert(:user, attributes)
+    %{user | name: user.display_name || user.handle}
+  end
+
+  def insert!(factory_name, attributes) do
     insert(factory_name, attributes)
   end
 

test/support/stripe_mock.ex

@@ -82,4 +82,11 @@ defmodule Algora.Support.StripeMock do
        }}
     end
   end
+
+  defmodule Customer do
+    @moduledoc false
+    def create(_params) do
+      {:ok, %Stripe.Customer{id: "cus_#{Algora.Util.random_int()}"}}
+    end
+  end
 end