Question: “My credit card bill was due on Friday and I paid it on Sunday. Will it be reported as default?”
Answer: No. RBI provides a 3-day grace period. Payments within this period cannot be reported as default.

Supporting evidence:
title: rbi.org.in/BS_ViewMasDirections.aspx
quote: Card-issuers shall report a credit card account as 'past due' to credit information companies (CICs) or levy penal charges, viz. late payment charges and other related charges, if any, only when a credit card account remains 'past due' for more than three days
context: nths / years with consequential compounded interest payment on your outstanding balance" shall be prominently displayed in all the billing statements to caution the cardholders about the pitfalls in paying only the minimum amount due. The MITC shall specifically explain that the 'interest-free credit period' is suspended if any balance of the previous month's bill is outstanding. iv. For this purpose, card-issuers shall work out illustrative examples and include the same in the Welcome Kit sent to the cardholders and also place it on their website. v. v Card-issuers shall report a credit card account as 'past due' to credit information companies (CICs) or levy penal charges, viz. late payment charges and other related charges, if any, only when a credit card account remains 'past due' for more than three days. The number of 'days past due' and late payment charges shall, however, be computed from the payment due date mentioned in the credit card statement, as specified under the regulatory instructions on 'Prudential norms on Income Recognition, Asset Classification and Provisioning pertaining to Advances' amended from time to time. Late payment charges and other related charges shall be levied, only on the outstanding amount after the due date, and not on the total amount due. vi. vi Interest shall be levied only on the outstanding amount, adjusted for payments/refunds/reversed transactions. vii. Changes in charges shall be made only with prospective effect giving prior notice of at least one month.

If a cardholder desires to surrender his/her card on account of any change in charges to his/her disadvantage, he/she shall be permitted to do so without levying any extra charge for such closure, subject to payment of all dues by the cardholder. viii. There shall not be any hidden charges while issuing credit cards free of charge.

(h) Card-issuers shall seek explicit consent of the cardholder to adjust credit amount beyond a cut-off, one percent of the credit limit or ₹5000, whichever is lower, arising out of refund/failed/reversed transactions or similar transactions against the credit limit for which payment has already been made by the cardholder. The consent shall be obtained through e-mail or SMS within seven days of the credit transaction. The card-issuers shall reverse the credit transaction to the cardholder’s bank account, if no consent/response is received from the cardholder. Notwithstanding the cut-off, if a cardholder makes a request to the car