You can follow several methods to find your Customer ID in India Post Payments Bank. The most straightforward way is to check your passbook or account statement, as the Customer ID is usually printed there. Alternatively, you can log into your internet banking account, where the dashboard typically displays your Customer ID. If you're still having trouble, contacting customer service via their helpline or visiting a local branch can help you retrieve your Customer ID. This ID is crucial for securely identifying your account and conducting various banking transactions.