function wpf_sync_coupon( $affiliate_id ) {

    if ( ! function_exists( 'wp_fusion' ) ) {
        return;
    }

    $args = array(
        'post_type'   => 'shop_coupon',
        'numberposts' => 1,
        'meta_key'    => 'affwp_discount_affiliate',
        'meta_value'  => $affiliate_id,
        'fields'      => 'ids',
    );

    $coupons = get_posts( $args );

    if ( ! empty( $coupons ) ) {

        $coupon = new WC_Coupon( $coupons[0] );

        $affiliate = affwp_get_affiliate( $affiliate_id );

        wp_fusion()->user->push_user_meta( $affiliate->user_id, array( 'affwp_coupon_code' => $coupon->get_code() ) );

    }

}

add_action( 'affwp_insert_affiliate', 'wpf_sync_coupon', 20 );


function add_coupon_field( $meta_fields ) {

    $meta_fields['affwp_coupon_code'] = array( 'label' => 'Generated coupon code', 'group' => 'awp' );

    return $meta_fields;

}

add_filter( 'wpf_meta_fields', 'add_coupon_field' );