y(
					'a'      => array(
						'href' => true,
					),
					'code'   => array(),
					'strong' => array(),
				)
			)
		);
	}

	/**
	 * Get settings fields.
	 *
	 * @return array<int, array<string, callable|int|string|bool|array<int|string,int|string>>>
	 */
	public function get_settings_fields() {
		$fields = array();

		// Refresh Token.
		$fields[] = array(
			'section'  => 'general',
			'filter'   => \FILTER_SANITIZE_STRING,
			'meta_key' => '_pronamic_gateway_omnikassa_2_refresh_token',
			'title'    => \_x( 'Refresh Token', 'omnikassa', 'pronamic_ideal' ),
			'type'     => 'textarea',
			'classes'  => array( 'code' ),
		);

		// Signing Key.
		$fields[] = array(
			'section'  => 'general',
			'filter'   => \FILTER_SANITIZE_STRING,
			'meta_key' => '_pronamic_gateway_omnikassa_2_signing_key',
			'title'    => \_x( 'Signing Key', 'omnikassa', 'pronamic_ideal' ),
			'type'     => 'text',
			'classes'  => array( 'large-text', 'code' ),
		);

		// Purchase ID.
		$code_field = \sprintf( '<code>%s</code>', 'merchantOrderId' );

		$fields[] = array(
			'section'     => 'advanced',
			'filter'      => \FILTER_SANITIZE_STRING,
			'meta_key'    => '_pronamic_gateway_omnikassa_2_order_id',
			'title'       => \__( 'Order ID', 'pronamic_ideal' ),
			'type'        => 'text',
			'classes'     => array( 'regular-text', 'code' ),
			'tooltip'     => \sprintf(
				/* translators: %s: <code>merchantOrderId</code> */
				\__( 'This setting defines the OmniKassa 2.0 %s field.', 'pronamic_ideal' ),
				$code_field
			),
			'description' => \sprintf(
				'%s<br />%s %s<br />%s',
				\sprintf(
					/* translators: %s: <code>merchantOrderId</code> */
					\__(
						'The OmniKassa 2.0 %s field must consist strictly of 24 alphanumeric characters, other characters, such as ".", "@", " " (space), etc. are not allowed.',
						'pronamic_ideal'
					),
					$code_field
				),
				\__( 'Available tags:', 'pronamic_ideal' ),
				\sprintf(
					'<code>%s</code> <code>%s</code>',
					'{order_id}',
					'{payment_id}'
				),
				\sprintf(
					/* translators: %s: default code */
					\__( 'Default: <code>%s</code>', 'pronamic_ideal' ),
					'{payment_id}'
				)
			),
		);

		// Webhook.
		$fields[] = array(
			'section'  => 'feedback',
			'title'    => \__( 'Webhook URL', 'pronamic_ideal' ),
			'type'     => 'text',
			'classes'  => array( 'large-text', 'code' ),
			'value'    => \rest_url( self::REST_ROUTE_NAMESPACE . '/webhook' ),
			'readonly' => true,
			'tooltip'  => \__(
				'The Webhook URL as sent with each transaction to receive automatic payment status updates on.',
				'pronamic_ideal'
			),
		);

		return $fields;
	}

	/**
	 * Get configuration by post ID.
	 *
	 * @param int $post_id Post ID.
	 * @return Config
	 */
	public function get_config( $post_id ) {
		$config = new Config();

		$config->post_id                  = \intval( $post_id );
		$config->mode                     = $this->get_meta( $post_id, 'mode' );
		$config->refresh_token            = $this->get_meta( $post_id, 'omnikassa_2_refresh_token' );
		$config->signing_key              = $this->get_meta( $post_id, 'omnikassa_2_signing_key' );
		$config->access_token             = $this->get_meta( $post_id, 'omnikassa_2_access_token' );
		$config->access_token_valid_until = $this->get_meta( $post_id, 'omnikassa_2_access_token_valid_until' );
		$config->order_id                 = $this->get_meta( $post_id, 'omnikassa_2_order_id' );

		return $config;
	}

	/**
	 * Delete access token meta for the specified post ID.
	 *
	 * @link https://github.com/WordPress/WordPress/blob/5.0/wp-includes/post.php#L3724-L3736
	 * @link https://codex.wordpress.org/Function_Reference/delete_post_meta
	 * @param int $post_id Post ID.
	 * @return void
	 */
	public static function delete_access_token_meta( $post_id ) {
		\delete_post_meta( $post_id, '_pronamic_gateway_omnikassa_2_access_token' );
		\delete_post_meta( $post_id, '_pronamic_gateway_omnikassa_2_access_token_valid_until' );
	}

	/**
	 * Get gateway.
	 *
	 * @param int $post_id Post ID.
	 * @return Gateway
	 */
	public function get_gateway( $post_id ) {
		return new Gateway( $this->get_config( $post_id ) );
	}
}