PayPal Checkout Integration Issue in OpenCart – Subscription Not Working

[vunamweb]

Hello Support Team,

I am experiencing an issue with the PayPal checkout integration in my OpenCart store (version 4.0.2.3). Specifically, subscription payments are not processing correctly. Here are the details of the problem:

1. install this extension on sandbox mode
2. Go to Catalog > Recurring Profiles in the OpenCart admin to create a new Recurring Profiles and set information as price, duration, Frequency
3. Assign this Recurring Profile to a Product in Opencart admin
4. Complete payment with products that are ready to set a Recurring Profile on website frontend
5. I logged in sandbox account but I didn't see this payment in Manage subscriptions

Could you please help me diagnose and fix this issue?
Thanks So Much

Best Regards
Vu Nam