establish base code

libs/settings.php

@@ -0,0 +1,87 @@
+<?php
+
+class fourthwall_settings {
+
+	public function __construct() {
+
+		add_action( 'admin_menu', array( $this, 'add_admin_menu' ) );
+		add_action( 'admin_init', array( $this, 'init_settings'  ) );
+
+	}
+
+	public function add_admin_menu() {
+
+		add_menu_page(
+			esc_html__( 'Fourthwall Store Embed', 'fourthwall_text_domain' ),
+			esc_html__( 'FourthWall Embed', 'fourthwall_text_domain' ),
+			'manage_options',
+			'fwembed',
+			array( $this, 'fourthwall_page_layout' ),
+			'dashicons-store',
+			10
+		);
+
+	}
+
+	public function init_settings() {
+
+		register_setting(
+			'fourthwall_settings_group',
+			'fourthwall_settings_name'
+		);
+
+		add_settings_section(
+			'fourthwall_settings_name_section',
+			'',
+			false,
+			'fourthwall_settings_name'
+		);
+
+		add_settings_field(
+			'fourth_url',
+			__( 'Store URL', 'fourthwall_text_domain' ),
+			array( $this, 'render_fourth_url_field' ),
+			'fourthwall_settings_name',
+			'fourthwall_settings_name_section'
+		);
+
+	}
+
+	public function fourthwall_page_layout() {
+
+		// Check required user capability
+		if ( !current_user_can( 'manage_options' ) )  {
+			wp_die( esc_html__( 'You do not have sufficient permissions to access this page.', 'fourthwall_text_domain' ) );
+		}
+
+		// Admin Page Layout
+		echo '<div class="wrap">' . "\n";
+		echo '	<h1>' . get_admin_page_title() . '</h1>' . "\n";
+		echo '	<form action="options.php" method="post">' . "\n";
+
+		settings_fields( 'fourthwall_settings_group' );
+		do_settings_sections( 'fourthwall_settings_name' );
+		submit_button();
+
+		echo '	</form>' . "\n";
+		echo '</div>' . "\n";
+
+	}
+
+	function render_fourth_url_field() {
+
+		// Retrieve data from the database.
+		$options = get_option( 'fourthwall_settings_name' );
+
+		// Set default value.
+		$value = isset( $options['fourth_url'] ) ? $options['fourth_url'] : '';
+
+		// Field output.
+		echo '<input type="url" name="fourthwall_settings_name[fourth_url]" class="regular-text fourth_url_field" placeholder="' . esc_attr__( 'https://some-shop.fourthwall.com', 'fourthwall_text_domain' ) . '" value="' . esc_attr( $value ) . '">';
+		echo '<p class="description">' . __( 'The fourth wall URL', 'fourthwall_text_domain' ) . '</p>';
+
+	}
+
+}
+
+new fourthwall_settings;