Max Content Sale

/**
 * Maximum Content Purchases
 * Enforces a maximum number times a post can be purchased.
 * @version 1.0
 */
function mycred_pro_limit_content_purchases( $buttons, $user_id, $post_id ) {

    if ( $buttons === false ) return $buttons;

    global $mycred_sold_out;

    $maximum_sales = 5;
    $count         = mycred_count_ref_id_instances( 'buy_content', $post_id, NULL, MYCRED_DEFAULT_TYPE_KEY );

    // If we reached our limit, pretend the user can not afford to pay for this content
    if ( $count >= $maximum_sales ) {

        $mycred_sold_out = true;

        return false;

    }

    return $buttons;

}
add_filter( 'mycred_sellcontent_buttons', 'mycred_pro_limit_content_purchases', 10, 3 );

/**
 * Sold Out Template
 * @version 1.0
 */
function mycred_pro_show_sold_out_template( $template ) {

    global $mycred_sold_out;

    if ( $mycred_sold_out === true )
        return '<p>This content has sold out.</p>';

    return $template;

}
add_filter( 'mycred_sell_content_template', 'mycred_pro_show_sold_out_template' );