Creates a custom myCRED hook to award creds on Restrict content pro subscription renewal

functions.php

<?php
add_filter( 'mycred_setup_hooks', 'custom_hook_renew_rcpro_subscription' );
function custom_hook_renew_rcpro_subscription( $installed )
{
	$installed['hook_rcpro_renew_subs'] = array(
		'title'       => __( '%_plural% for RCP Subscription renewal', 'mycred' ),
		'description' => __( 'Award %_plural% when RCP subscription is renewed', 'mycred' ),
		'callback'    => [ 'myCRED_Hook_Rcpro_Renew' ]
	);

	return $installed;
}

if ( !class_exists( 'myCRED_Hook_Rcpro_Renew' ) ) {
	Class myCRED_Hook_Rcpro_Renew extends myCRED_Hook {
		/**
		 * Construct
		 */
		function __construct( $hook_prefs, $type ) {
			parent::__construct( array(
				'id'       => 'hook_rcpro_renew_subs',
				'defaults' => array(
					'creds'   => 1,
					'log'     => '%plural% for RCP subscription renewal'
				)
			), $hook_prefs, $type );
		}

		/**
		 * Hook into WordPress
		 */
		public function run() {
			add_action( 'rcp_membership_post_renew',  array( $this, 'rcp_membership_renew' ), 10, 3 );
		}

		/**
		 * Check if the user qualifies for points
		 */
		public function rcp_membership_renew( $expiration, $membership_id, $membership ) {
			$user_id = $membership->get_customer()->get_user_id();

			// Check if user is excluded (required)
			if ( $this->core->exclude_user( $user_id ) ) return;

			// Make sure this is a unique event
			if ( $this->has_entry( 'hook_rcpro_renew_subs', '', $user_id ) ) return;

			// Execute
			$this->core->add_creds(
				'hook_rcpro_renew_subs',
				$user_id,
				$this->prefs['creds'],
				$this->prefs['log'],
				$membership_id,
				[ 'ref_type' => 'rcp_membership' ],
				$this->mycred_type
			);
		}

		/**
		 * Add Settings
		 */
		public function preferences() {
			// Our settings are available under $this->prefs
			$prefs = $this->prefs; ?>

			<!-- First we set the amount -->
			<label class="subheader"><?php echo $this->core->plural(); ?></label>
			<ol>
				<li>
					<div class="h2"><input type="text" name="<?php echo $this->field_name( 'creds' ); ?>" id="<?php echo $this->field_id( 'creds' ); ?>" value="<?php echo esc_attr( $prefs['creds'] ); ?>" size="8" /></div>
				</li>
			</ol>
			<!-- Then the log template -->
			<label class="subheader"><?php _e( 'Log template', 'mycred' ); ?></label>
			<ol>
				<li>
					<div class="h2"><input type="text" name="<?php echo $this->field_name( 'log' ); ?>" id="<?php echo $this->field_id( 'log' ); ?>" value="<?php echo esc_attr( $prefs['log'] ); ?>" class="long" /></div>
				</li>
			</ol>
			<?php
		}

		/**
		 * Sanitize Preferences
		 */
		public function sanitise_preferences( $data ) {
			$new_data = $data;

			// Apply defaults if any field is left empty
			$new_data['creds'] = ( !empty( $data['creds'] ) ) ? $data['creds'] : $this->defaults['creds'];
			$new_data['log'] = ( !empty( $data['log'] ) ) ? sanitize_text_field( $data['log'] ) : $this->defaults['log'];

			return $new_data;
		}
	}
}