[FIX] payment_razorpay: fix mandate max amount error

Steps:
- Install subscription and razorpay app.
- Configure razorpay provider with tokenizable
razorpay account.
- Enable allow tokenize field.
- create subscription with more then 100k and
less then 500k amount.
- Try to pay that subscription with razorpay.

Issue:
- Throwing limit exceed warning even though amount
is less then 500k which can create token and paid
normally.

Cause:
- We forgot to check minimum of method max amount and
amount * 5 to send proper mandate max amount while
creating token and because of that paying more then
100k via subscription raise error even to it should
processed normally.

Fix:
- Check minimum of `method max amount` and `amount * 5`
to send proper mandate max amount so it'll not raise
error while paying amount in between 100k to 500k.

closes odoo/odoo#150410

Related: odoo/enterprise#55009
Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>

addons/payment_razorpay/const.py

@@ -113,7 +113,7 @@ DEFAULT_PAYMENT_METHODS_CODES = [
 
 # The maximum amount in INR that can be paid through an eMandate.
 MANDATE_MAX_AMOUNT = {
-    'card': 500000,
+    'card': 1000000,
     'upi': 100000,
 }
 

addons/payment_razorpay/models/payment_transaction.py

@@ -125,7 +125,7 @@ class PaymentTransaction(models.Model):
             if self.tokenize:
                 payload['token'] = {
                     'max_amount': payment_utils.to_minor_currency_units(
-                        self._get_mandate_max_amount(), self.currency_id
+                        self._razorpay_get_mandate_max_amount(), self.currency_id
                     ),
                     'expire_at': time.mktime(
                         (datetime.today() + relativedelta(years=10)).timetuple()
@@ -147,20 +147,23 @@ class PaymentTransaction(models.Model):
             })
         return payload
 
-    def _get_mandate_max_amount(self):
+    def _razorpay_get_mandate_max_amount(self):
         """ Return the eMandate's maximum amount to define.
 
         :return: The eMandate's maximum amount.
         :rtype: int
         """
-        mandate_values = self._get_mandate_values()
-        if 'amount' in mandate_values:
-            max_amount = mandate_values['amount'] * 5  # FP's rule of thumb for a good max amount.
+        pm_code = (
+            self.payment_method_id.primary_payment_method_id or self.payment_method_id
+        ).code
+        pm_max_amount = const.MANDATE_MAX_AMOUNT.get(pm_code, 100000)
+        mandate_values = self._get_mandate_values()  # The linked document's values.
+        if 'amount' in mandate_values and 'MRR' in mandate_values:
+            max_amount = min(
+                pm_max_amount, max(mandate_values['amount'] * 1.5, mandate_values['MRR'] * 5)
+            )
         else:
-            pm_code = (
-                self.payment_method_id.primary_payment_method_id or self.payment_method_id
-            ).code
-            max_amount = const.MANDATE_MAX_AMOUNT.get(pm_code, 100000)
+            max_amount = pm_max_amount
         return max_amount
 
     def _send_payment_request(self):

addons/payment_razorpay/tests/test_payment_transaction.py

@@ -89,7 +89,7 @@ class TestPaymentTransaction(RazorpayCommon):
             'token': {
                 "expire_at": token_expiry_timeslamp,
                 "frequency": "as_presented",
-                'max_amount': 50000000,
+                'max_amount': 100000000,
             },
             'amount': converted_amount,
             'currency': tx.currency_id.name,