code: async def deserialize(data: dict):
          
  
          credential = await Credential._deserialize("vcx_credential_deserialize",
                                                     json.dumps(data),
                                                     data.get('data').get('source_id'))
          return credential
docs: Create a credential object from a previously serialized credential object
          :param data: JSON data from a serialized object.
          :return: A created credential
          Example:
          credential = await Credential.create(source_id, offer)
          data = await credential.serialize()
          credential2 = await Credential.deserialize(data)