docs: async def send_offer(self, connection: Connection):
          """
          Sends an offer to a prover.  Once accepted, a request will be recieved.
          :param connection: vcx.api.connection.Connection
          :return: None
  
          Example:
          source_id = '1'
          cred_def_id = 'cred_def_id1'
          attrs = {'key': 'value', 'key2': 'value2', 'key3': 'value3'}
          name = 'Credential Name'
          issuer_did = '8XFh8yBzrpJQmNyZzgoTqB'
          phone_number = '8019119191'
          price = 1
          issuer_credential = await IssuerCredential.create(source_id, attrs, cred_def_id, name, price)
          connection = await Connection.create(source_id)
          issuer_credential.send_offer(connection)
          """
          if not hasattr(IssuerCredential.send_offer, "cb"):
              self.logger.debug("vcx_issuer_send_credential_offer: Creating callback")
              IssuerCredential.send_offer.cb = create_cb(CFUNCTYPE(None, c_uint32, c_uint32))
  
          c_credential_handle = c_uint32(self.handle)
          c_connection_handle = c_uint32(connection.handle)
  
          await do_call('vcx_issuer_send_credential_offer',
                        c_credential_handle,
                        c_connection_handle,
                        IssuerCredential.send_offer.cb)