| coordinates | Yes | Array | One entry for each place where the signature should appear. Each signature block should specify the page number and the rectangles at which the sign stamp block will appear. |
| mobile_number | Optional | Valid 10-digit | Mobile number of the signatory. Either the mobile number or the email should be provided, if the mobile number is provided, OTP will be sent to that number, else OTP will be sent to the email. |
| email | Optional | Valid email address. | Email of the signatory. If the mobile number is not provided, email must be provided. |
| name | Yes | Name of the signatory. | The signature will appear with this name. |
| callback_url | Yes | The web address to which we will redirect once the signature is done. | We will add query parameters to the URL before redirection. The URL parameter will be success=True if the signature is successful, else it will be success=False. The callback URL will be appended with two additional parameters of document_id and signer_id always. |
