def METHOD_NAME(self, query: ast.Insert) -> None:
    """Inserts data into the Shopify "POST /customers" API endpoint.
    Parameters
    ----------
    query : ast.Insert
       Given SQL INSERT query
    Returns
    -------
    None
    Raises
    ------
    ValueError
        If the query contains an unsupported condition
    """
    insert_statement_parser = INSERTQueryParser(
        query,
        supported_columns=['first_name', 'last_name', 'email', 'phone', 'tags', 'currency'],
        mandatory_columns=['first_name', 'last_name', 'email', 'phone'],
        all_mandatory=False
    )
    customer_data = insert_statement_parser.parse_query()
    self.create_customers(customer_data)