Got this in email from stanchart. So they will be migrating soon to BBPS it seems.
As you are aware there are multiple methods to make a payment towards your outstanding credit card balance.
One of these methods is through the use of third-party apps like (but not limited to) PhonePe, Google Pay, CRED, Amazon Pay, Paytm and more.
To comply with the recent guidelines issued by Bharat Bill Pay System (BBPS), the Bank is in the process of enabling payments through third-party apps.
In the interim, we would like to inform you that your Standard Chartered Bank credit card payment through such platforms may no longer be supported.