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Your Paytm for business app is working and will keep working beyond March 15th, 2024. Click to know more
  • FAQ Topics
  • Testing and Generic Queries
  • JS Checkout
  • All in One SDK
  • Checksum
  • Callback and Webhook URL
  • Ecommerce Plugins
  • Custom Checkout
  • Refund
  • Disputes
  • UPI Solution
  • Subscription
  • Payment Links
  • Standard EMI/ No Cost EMI
  • Auto Debit
  • Custom UI SDK
  • Bank Offers
  • Settlement
  • Merchant Dashboard
  • DIY Onboarding

How can we help you today?

    • Checksum
    1. What is Checksum?+
    2. What is the usage of merchant key and is it used as parameter for the checksum generation?-

      Merchant key (secure key) is used to generate and verify checksum only and is not to be sent as any parameter to PG (payment gateway). This should not be shared with anyone.

    3. Why am I getting mismatch/Invalid checksum in the response from Paytm?+
    4. How will the checksum be generated for website, android and iOS integration?+
    5. How will the checksum be verified for website, android and iOS integration?+
    6. When I download the checksum php file from github there is no 'lib' folder. So how or where do enter my key?+
    7. We are developing an app with no backend, how to generate checksum?+
    If you are an existing Paytm for Business customer, call us on
    Contact for any query - call image0120-4440440
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    Looking for any query related to solution offering. visit our Paytm for business support page