generated: '2026-07-11' method: derived source: openapi/paytm-openapi.yml summary: types: - apiKey api_key_in: - header schemes: - name: paytmChecksum type: apiKey in: header parameter: signature description: Checksum signature computed over the request body using Paytm's merchant key. Carried in the request head.signature property and/or as a request header per endpoint guidance. sources: - openapi/paytm-openapi.yml