What is checksum?

1. Payment gateway have a mechanism to detect Fraudulent activities.

2. If any entity tries to hack during Payment process to change the price, Payment gateway will show a checksum error.

Below are the reasons for this error?

1. There could be virus in your customer's system.

2. Some entity actually hacking tries to hack.

3. Your Merchant Key/Salt key is incorrect. In this case, Please contact your Payment Gateway.