[FIX] account, website_portal_sale: _generate_and_pay_invoice in other currency

When paying in other currency that the one defined  in the company, it
generates a payment which has to be in the currency of the transaction.
Otherwise it will generate an invoice which won't be completely paid.

opw:769278

addons/account/models/account_invoice.py

@@ -1113,7 +1113,7 @@ class AccountInvoice(models.Model):
         if self.origin:
             communication = '%s (%s)' % (communication, self.origin)
 
-        payment = self.env['account.payment'].create({
+        payment_vals = {
             'invoice_ids': [(6, 0, self.ids)],
             'amount': pay_amount or self.residual,
             'payment_date': date or fields.Date.context_today(self),
@@ -1125,7 +1125,11 @@ class AccountInvoice(models.Model):
             'payment_method_id': payment_method.id,
             'payment_difference_handling': writeoff_acc and 'reconcile' or 'open',
             'writeoff_account_id': writeoff_acc and writeoff_acc.id or False,
-        })
+        }
+        if self.env.context.get('tx_currency_id'):
+            payment_vals['currency_id'] = self.env.context.get('tx_currency_id')
+
+        payment = self.env['account.payment'].create(payment_vals)
         payment.post()
 
         return True

addons/website_portal_sale/models/payment.py

@@ -29,7 +29,7 @@ class PaymentTransaction(models.Model):
 
             created_invoice.action_invoice_open()
             if tx.acquirer_id.journal_id:
-                created_invoice.pay_and_reconcile(tx.acquirer_id.journal_id, pay_amount=created_invoice.amount_total)
+                created_invoice.with_context(tx_currency_id=tx.currency_id.id).pay_and_reconcile(tx.acquirer_id.journal_id, pay_amount=created_invoice.amount_total)
                 if created_invoice.payment_ids:
                     created_invoice.payment_ids[0].payment_transaction_id = tx
             else: