/**
	 * Map request keys to database keys for insertion
	 *
	 * Array keys are the request fields (as defined in the schema) and
	 * array values are the database fields.
	 *
	 * @since 1.0.0-beta.1
	 * @since 1.0.0-beta.11 Correctly map request's `billing_postcode` param to `billing_zip` meta.
	 *
	 * @return array
	 */
	protected function map_schema_to_database() {

		$map = parent::map_schema_to_database();

		$map['username']         = 'user_login';
		$map['password']         = 'user_pass';
		$map['name']             = 'display_name';