[FIX] payment_stripe: missing route

In case an invoice is required to be paid thanks to the route
'/my/invoices/', the user is redirected to '/shop/payment/transaction/'.
If website_sale is not installed, this causes a crash.

Complement of 2bd17285ea

opw-813481

addons/payment_stripe/static/src/js/stripe.js

@@ -97,7 +97,10 @@ odoo.define('payment_stripe.stripe', function(require) {
         if (so_id) {
             so_id = parseInt(so_id[1]);
         }
-
+        var invoice_id = $("input[name='return_url']").val().match(/invoices\/([0-9]+)/) || undefined;
+        if (invoice_id) {
+            invoice_id = parseInt(invoice_id[1]);
+        }
 
         var currency = $("input[name='currency']").val();
         var currency_id = $("input[name='currency_id']").val();
@@ -127,6 +130,13 @@ odoo.define('payment_stripe.stripe', function(require) {
             }).then(function (data) {
                 try { provider_form.innerHTML = data; } catch (e) {};
             });
+        } else if (window.location.href.includes("/my/invoices/")) {
+            var create_tx = ajax.jsonRpc('/invoice/pay/' + invoice_id + '/form_tx/', 'call', {
+                access_token: access_token,
+                acquirer_id: acquirer_id
+            }).then(function (data) {
+                try { provider_form.innerHTML = data; } catch (e) {};
+            });
         }
         else {
             var create_tx = ajax.jsonRpc('/shop/payment/transaction/' + acquirer_id, 'call', {