http_client = options["http"]
        if isinstance(http_client, str):
            implementation = next((impl for impl in _HTTP_CLIENT_IMPL if impl.__name__ == http_client), None)
            if implementation is None:
                raise ValueError(f"HTTP Client '{token_repository}' not recognized.")
        elif not isinstance(http_client, HttpClient):
            raise ValueError(f"HTTP Client '{token_repository}' not recognized.")
        _HTTP_CLIENT = http_client

    def test_token_grant_v3(self):
        initialize(options={
            'http': 'RequestsHttpClient',
        })
        res, err = token_grant_v3('client_credentials')
        self.assertIsNone(err)

Traceback (most recent call last):
  File "/Users/cypher/.pyenv/versions/3.7.6/lib/python3.7/unittest/case.py", line 59, in testPartExecutor
    yield
  File "/Users/cypher/.pyenv/versions/3.7.6/lib/python3.7/unittest/case.py", line 628, in run
    testMethod()
  File "/Users/cypher/Projects/accelbyte-python-sdk/test/unit/test_http_client.py", line 24, in test_token_grant_v3
    res, err = token_grant_v3('client_credentials')
  File "/Users/cypher/Projects/accelbyte-python-sdk/accelbyte_py_sdk/api/iam/wrappers/_o_auth2_0.py", line 130, in token_grant_v3
    return run_request(request)
  File "/Users/cypher/Projects/accelbyte-python-sdk/accelbyte_py_sdk/core/_core.py", line 254, in run_request
    request, error = http_client.create_request(operation, base_url, headers, **kwargs)
AttributeError: 'str' object has no attribute 'create_request'