code: async def revoke_credential(self):
          
          if not hasattr(IssuerCredential.revoke_credential, "cb"):
              self.logger.debug("vcx_issuer_revoke_credential: Creating callback")
              IssuerCredential.revoke_credential.cb = create_cb(CFUNCTYPE(None, c_uint32, c_uint32))
  
          c_credential_handle = c_uint32(self.handle)
  
          await do_call('vcx_issuer_revoke_credential',
                        c_credential_handle,
                        IssuerCredential.revoke_credential.cb)
docs: Revokes a credential.
          :return: None
              Example:
              credential.revoke_credential()