Process - Need to upload the signed document from Docusign to pipefy cardfield.

For the above process, I am currently using make.com. The article that I am referring is: https://developers.pipefy.com/docs/how-to-upload-attachments-and-attach-to-a-card-record

The URL that is being generated in the first stage is showing error “The request signature we calculated does not match the signature you provided. Check your key and signing method.” 

Thanks in advance. Any help would be really appreciated!