Why did the mutual fund order get rejected?

Mutual fund orders get rejected for the following reasons:

• If the payment for AMC SIPs is not completed within T+5 days from the pending payments page. See How to complete SIP payments on Coin web?
• If the payment for Zerodha SIPs is not completed within 5 calendar days from the pending payments page. See How to complete SIP payments on Coin web?
• Third Party Verification (TPV) for the bank account is invalid. See Why is the mutual fund order rejected with the error TPV Invalid?
• If the orders are rejected by the RTA due to discrepancies such as name mismatch, bank details mismatch, account type mismatch, etc. To solve this, please create a ticket and share the bank statement or a cancelled cheque with the following details clearly visible: Name of the account holder, bank account number, name, branch and IFSC. Zerodha will contact the RTA for a quick resolution.
  

If the mutual fund order gets rejected after completing the payment, see Why was the mutual fund order rejected even after completing the payment?