First release

.gitignore

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+# IDE
+.idea
+.vscode
+
+# dependency
+bower_components
+node_modules
+
+# dist
+*.min.js
+
+# log
+*.log
+
+# lock
+yarn.lock
+package-lock.json

css/main.css

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+.ppy-input-desc {
+  padding-top: 4px;
+  padding-left: 4px;
+  color: #afafaf;
+}
+
+.ppy-qrcode {
+  max-width: 340px;
+  max-height: 340px;
+}
+
+.ppy-qrcode svg {
+  width: 100%;
+  height: 100%;
+}

js/main.js

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+const qrcode = require('qrcode');
+const generatePayload = require('promptpay-qr');
+
+const opt = {
+  type: 'svg'
+};
+
+jQuery(document).ready(function () {
+  const $body = jQuery('body');
+  const isAdmin = $body.hasClass('wp-admin');
+
+  if (isAdmin) {
+    // do live edit
+  } else {
+    const $qrcodes = jQuery('.ppy-qrcode');
+    jQuery.each($qrcodes, function () {
+      const $ele = jQuery(this);
+      /** @type string */
+      const id = jQuery(this).data('promptpay-id').toString();
+      /** @type number */
+      const amount = parseFloat(jQuery(this).data('amount'));
+
+      if (id) {
+        const payload = generatePayload(id, {
+          amount: 0
+        });
+
+        qrcode.toString(payload, opt, function (err, svg) {
+          if (err) {
+            console.log('err', err);
+          } else {
+            $ele.html(svg);
+          }
+        })
+      }
+    });
+  }
+});

package.json

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+{
+  "scripts": {
+    "build.watch": "webpack js/main.js js/main.min.js -d --watch",
+    "build.prod": "webpack js/main.js js/main.min.js -p"
+  },
+  "dependencies": {
+    "promptpay-qr": "^0.4.3",
+    "qrcode": "^0.9.0",
+    "webpack": "^3.5.6"
+  }
+}

promptpay.php

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+<?php
+/*
+Plugin Name: PromptPay
+Plugin URI: https://wordpress.org/plugins/promptpay/
+Description: PromptPay integration for WordPress
+Version: 1.0.0
+Author: Nathachai Thongniran
+Author URI: http://jojoee.com/
+Text Domain: ppy
+License: GPL2+
+License URI: https://www.gnu.org/licenses/gpl-2.0.html
+*/
+
+define( 'PPY_BASE_FILE', plugin_basename( __FILE__ ) );
+define( 'PPY_PLUGIN_NAME', 'PromptPay' );
+
+class PromptPay {
+
+  public function __construct() {
+    $this->is_debug           = false;
+    $this->menu_page          = 'promptpay';
+    $this->option_group_name  = 'ppy_option_group';
+    $this->option_field_name  = 'ppy_option_field';
+    $this->setting_section_id = 'ppy_setting_section_id';
+
+    $this->options = get_option( $this->option_field_name );
+
+    // set default prop
+    // for only
+    // - first time
+    // - no submitting form
+    $this->set_default_prop();
+
+    // backend: menu
+    add_action( 'admin_menu', array( $this, 'admin_menu' ) );
+    add_action( 'admin_init', array( $this, 'admin_init' ) );
+
+    // backend: plugin
+    add_filter( 'plugin_action_links', array( $this, 'plugin_action_links' ), 10, 4 );
+
+    // script
+    add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
+    add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
+
+    // shortcode
+    add_shortcode( 'promptpayqr', array( $this, 'shortcode_qrcode' ) );
+  }
+
+  /** ================================================================ shortcode
+   */
+
+  public function shortcode_qrcode() {
+    $options      = $this->options;
+    $promptpay_id = $options['field_promptpay_id'];
+    $amount       = 0;
+    $html         = sprintf( '<div class="ppy-qrcode" data-promptpay-id="%s" data-amount="%f"></div>',
+      $promptpay_id,
+      $amount
+    );
+
+    return $html;
+  }
+
+  /** ================================================================ backend: menu
+   */
+
+  public function admin_menu() {
+    add_options_page(
+      PPY_PLUGIN_NAME,
+      PPY_PLUGIN_NAME,
+      'manage_options',
+      $this->menu_page,
+      array( $this, 'admin_page' )
+    );
+  }
+
+  public function admin_page() {
+    $this->dump(); ?>
+    <div class="wrap">
+      <h1><?= PPY_PLUGIN_NAME; ?></h1>
+      <form method="post" action="options.php">
+        <?php
+        settings_fields( $this->option_group_name );
+        do_settings_sections( $this->menu_page );
+        submit_button();
+        ?>
+      </form>
+    </div>
+    <style>
+    <?php
+  }
+
+  public function admin_init() {
+    register_setting(
+      $this->option_group_name,
+      $this->option_field_name,
+      array( $this, 'sanitize' )
+    );
+
+    // section
+    add_settings_section(
+      $this->setting_section_id,
+      'Settings',
+      array( $this, 'print_section_info' ),
+      $this->menu_page
+    );
+
+    // option field(s)
+    // - field_promptpay_id
+    add_settings_field(
+      'field_promptpay_id',
+      'PromptPay ID',
+      array( $this, 'field_promptpay_id_callback' ),
+      $this->menu_page,
+      $this->setting_section_id
+    );
+  }
+
+  /** ================================================================ backend: page
+   */
+
+  /** ================================================================ backend: field
+   */
+
+  public function set_default_prop() {
+    // default
+    // [
+    //   'field_promptpay_id' => ''
+    // ]
+
+    $options = $this->options;
+
+    if ( ! isset( $options['field_promptpay_id'] ) ) {
+      $options['field_promptpay_id'] = '';
+    }
+
+    $this->options = $options;
+  }
+
+  /**
+   * Sanitize each setting field as needed
+   *
+   * @param array $input Contains all settings fields as array keys
+   *
+   * @return array[]
+   */
+  public function sanitize( $input ) {
+    $result = array();
+
+    // text
+    $text_input_ids = array(
+      'field_promptpay_id',
+    );
+    foreach ( $text_input_ids as $text_input_id ) {
+      $result[ $text_input_id ] = isset( $input[ $text_input_id ] )
+        ? sanitize_text_field( $input[ $text_input_id ] )
+        : '';
+    }
+
+    return $result;
+  }
+
+  public function print_section_info() {
+    print 'Enter your settings below:';
+  }
+
+  /** ================================================================ backend: field
+   */
+
+  public function field_promptpay_id_callback() {
+    $field_id    = 'field_promptpay_id';
+    $field_name  = $this->option_field_name . "[$field_id]";
+    $field_value = $this->options[ $field_id ];
+
+    printf( '<input type="text" id="%s" placeholder="PromptPay ID" name="%s" value="%s" />',
+      $field_id,
+      $field_name,
+      $field_value
+    );
+    printf( '<br><span class="ppy-input-desc">e.g. 1234567891234, 0841234567</span>' );
+  }
+
+  /** ================================================================ backend: plugin
+   */
+
+  /**
+   * @param string[] $links
+   * @param string $plugin_file
+   *
+   * @return array
+   */
+  public function plugin_action_links( $links = [], $plugin_file = '' ) {
+    $plugin_link = array();
+    if ( $plugin_file === PPY_BASE_FILE ) {
+      $plugin_link[] = sprintf( '<a href="%s">%s</a>',
+        admin_url( 'options-general.php?page=' . $this->menu_page ),
+        'Settings'
+      );
+    }
+
+    return array_merge( $links, $plugin_link );
+  }
+
+  /** ================================================================ debug
+   */
+
+  /**
+   * @param null $var
+   * @param bool $is_die
+   *
+   * @return bool
+   */
+  private function dd( $var = null, $is_die = true ) {
+    if ( ! $this->is_debug ) {
+      return false;
+    } else {
+      echo '<pre>';
+      print_r( $var );
+      echo '</pre>';
+
+      if ( $is_die ) {
+        die();
+      }
+    }
+  }
+
+  private function da( $var = null, $is_die = false ) {
+    $this->dd( $var, $is_die );
+  }
+
+  private function dump( $is_die = false ) {
+    $this->da( $this->options, $is_die );
+  }
+
+  private function reset() {
+    update_option( $this->option_field_name, array() );
+  }
+
+  /** ================================================================ frontend
+   */
+
+  public function enqueue_scripts() {
+    wp_enqueue_style( 'ppy-main-style', plugins_url( 'css/main.css', __FILE__ ) );
+    wp_enqueue_script( 'ppy-main-script', plugins_url( 'js/main.min.js', __FILE__ ), array( 'jquery' ) );
+  }
+}
+
+$prompt_pay = new PromptPay();

readme.txt

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+=== PromptPay ===
+
+Contributors: jojoee
+Donate link:
+Tags: payment, PromptPay, qrcode
+Requires at least: 3.0.1
+Tested up to: 4.8.1
+Stable tag: 4.3
+License: GPLv2 or later
+License URI: http://www.gnu.org/licenses/gpl-2.0.html
+
+== Description ==
+
+PromptPay integration for WordPress
+
+Features:
+
+* Shortcode
+
+Compatible with all browsers:
+
+* [Google Chrome](https://www.google.com/chrome/) 19+
+* [Mozilla Firefox](https://www.mozilla.org/firefox/) 3.6+
+* [Safari](http://www.apple.com/safari/) 3+
+* [Internet Explorer](https://www.microsoft.com/en-us/download/internet-explorer.aspx) 9+
+* [Opera](http://www.opera.com/) 10+
+
+== Installation ==
+
+1. Install the plugin via admin plguins screen or download and upload this plugin into `wp-content/plugins` directory
+2. Activate the plugin through the **Plugins** menu in WordPress
+3. Setup plugin via `Settings > PromptPay`
+
+== Frequently Asked Questions ==
+
+= How to use it =
+activate the plugin on your plugin dashboard (`/wp-admin/plugins.php`)
+
+== Screenshots ==
+
+1. Shortcode (screenshot-1.jpg)
+
+== Upgrade Notice ==
+
+Not available
+
+== Changelog ==
+
+= 1.0.0 (07 Sep 2016) =
+* First release
+
+== Notes ==
+
+* [WordPress Coding Standards](https://codex.wordpress.org/WordPress_Coding_Standards)
+* 2 spaces for indent
+* [Repository on Github](https://github.com/woodpeckerr/promptpay)
+
+= Thank you =
+* [WordPress Plugin readme.txt Validator](https://wordpress.org/plugins/about/validator/)
+* [Autoprefixer CSS online](https://autoprefixer.github.io/)
+* [PHP code syntax check](https://www.piliapp.com/php-syntax-check/)
+* [dtinth/promptpay-qr](https://github.com/dtinth/promptpay-qr)