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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def create_credentials(self, environment_id, source_type=None, credential_details=None, **kwargs):
 """ Create credentials. Creates a set of credentials to connect to a remote source. Created credentials are used in a configuration to associate a collection with the remote source. **Note:** All credentials are sent over an encrypted connection and encrypted at rest. :param str environment_id: The ID of the environment. :param str source_type: The source that this credentials object connects to. - `box` indicates the credentials are used to connect an instance of Enterprise Box. - `salesforce` indicates the credentials are used to connect to Salesforce. - `sharepoint` indicates the credentials are used to connect to Microsoft SharePoint Online. - `web_crawl` indicates the credentials are used to perform a web crawl. = `cloud_object_storage` indicates the credentials are used to connect to an IBM Cloud Object Store. :param CredentialDetails credential_details: Object containing details of the stored credentials. Obtain credentials for your source from the administrator of the source. :param dict headers: A `dict` containing the request headers :return: A `DetailedResponse` containing the result, headers and HTTP status code. :rtype: DetailedResponse """


        if environment_id is None:
            raise ValueError('environment_id must be provided')
        if credential_details is not None:
            credential_details = self._convert_model(credential_details,
                                                     CredentialDetails)

        headers = {}
        if 'headers' in kwargs:
            headers.update(kwargs.get('headers'))
        sdk_headers = get_sdk_headers('discovery', 'V1', 'create_credentials')
        headers.update(sdk_headers)

        params = {'version': self.version}

        data = {
            'source_type': source_type,
            'credential_details': credential_details
        }

        url = '/v1/environments/{0}/credentials'.format(
            *self._encode_path_vars(environment_id))
        response = self.request(
            method='POST',
            url=url,
            headers=headers,
            params=params,
            json=data,
            accept_json=True)
        return response