first commit

payment/gateway/paypal/db/install.php

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+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * paygw_paypal installer script.
+ *
+ * @package    paygw_paypal
+ * @copyright  2020 Marina Glancy
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+function xmldb_paygw_paypal_install() {
+    global $CFG;
+
+    // Enable the Paypal payment gateway on installation. It still needs to be configured and enabled for accounts.
+    $order = (!empty($CFG->paygw_plugins_sortorder)) ? explode(',', $CFG->paygw_plugins_sortorder) : [];
+    set_config('paygw_plugins_sortorder', join(',', array_merge($order, ['paypal'])));
+}

payment/gateway/paypal/db/install.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<XMLDB PATH="payment/gateway/paypal/db" VERSION="20201216" COMMENT="XMLDB file for PayPal payment gateway plugin"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="../../../../lib/xmldb/xmldb.xsd"
+>
+  <TABLES>
+    <TABLE NAME="paygw_paypal" COMMENT="Stores PayPal related information">
+      <FIELDS>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
+        <FIELD NAME="paymentid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false"/>
+        <FIELD NAME="pp_orderid" TYPE="char" LENGTH="255" NOTNULL="true" DEFAULT="The ID of the order in PayPal" SEQUENCE="false"/>
+      </FIELDS>
+      <KEYS>
+        <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
+        <KEY NAME="paymentid" TYPE="foreign-unique" FIELDS="paymentid" REFTABLE="payments" REFFIELDS="id"/>
+      </KEYS>
+    </TABLE>
+  </TABLES>
+</XMLDB>

payment/gateway/paypal/db/services.php

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+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * External functions and service definitions for the PayPal payment gateway plugin.
+ *
+ * @package    paygw_paypal
+ * @copyright  2020 Shamim Rezaie <shamim@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+$functions = [
+    'paygw_paypal_get_config_for_js' => [
+        'classname'   => 'paygw_paypal\external\get_config_for_js',
+        'classpath'   => '',
+        'description' => 'Returns the configuration settings to be used in js',
+        'type'        => 'read',
+        'ajax'        => true,
+    ],
+    'paygw_paypal_create_transaction_complete' => [
+        'classname'   => 'paygw_paypal\external\transaction_complete',
+        'classpath'   => '',
+        'description' => 'Takes care of what needs to be done when a PayPal transaction comes back as complete.',
+        'type'        => 'write',
+        'ajax'        => true,
+        'loginrequired' => false,
+    ],
+];

payment/gateway/paypal/db/upgrade.php

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+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Upgrade script for paygw_paypal.
+ *
+ * @package    paygw_paypal
+ * @copyright  2021 Shamim Rezaie <shamim@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+/**
+ * Upgrade the plugin.
+ *
+ * @param int $oldversion the version we are upgrading from
+ * @return bool always true
+ */
+function xmldb_paygw_paypal_upgrade(int $oldversion): bool {
+    global $DB;
+
+    $dbman = $DB->get_manager();
+
+    if ($oldversion < 2021052501) {
+        // Define key paymentid (foreign-unique) to be added to paygw_paypal.
+        $table = new xmldb_table('paygw_paypal');
+        $key = new xmldb_key('paymentid', XMLDB_KEY_FOREIGN_UNIQUE, ['paymentid'], 'payments', ['id']);
+
+        // Launch add key paymentid.
+        $dbman->add_key($table, $key);
+
+        // Paypal savepoint reached.
+        upgrade_plugin_savepoint(true, 2021052501, 'paygw', 'paypal');
+    }
+
+    // Automatically generated Moodle v4.2.0 release upgrade line.
+    // Put any upgrade step following this.
+
+    // Automatically generated Moodle v4.3.0 release upgrade line.
+    // Put any upgrade step following this.
+
+    // Automatically generated Moodle v4.4.0 release upgrade line.
+    // Put any upgrade step following this.
+
+    return true;
+}