Hi,

The DocuSign service is a popular way to electronically sign documents for a variety of business transactions. You can integrate DocuSign with your Pega 7 Platform application to collect digital signatures during case processing. You can sign, review, and exchange documents electronically, which eliminates having to manually print, sign, and scan documents back into your system. You can also make dynamic corrections and modifications to the documents before signing them.
Refer the below link for details.
https://community.pega.com/integrating-docusign-pega-7-platform/integrating-docusign-pega-7-platform

Thank You