Hi Abdul. Thanks for reaching out. In order to access the RS public API you will need to be on the appropriate subscription plan. API access starts at $99/mo, https://rightsignature.com/pricing. For developers we offer a 30-day trial sandbox, so please feel free to contact the team to get started on the API trial. Once on that plan, you will have access to an "API" administrative tab where you can request and manage keys.