Conditional myCRED Shortcode based on post authors balance.

add_shortcode( 'mycred_conditional_link', 'mycred_render_conditional_link' );
function mycred_render_conditional_link( $atts, $content ) {

    // Make sure myCRED is installed
    if ( ! function_exists( 'mycred' ) ) return 'myCRED is not installed';

    $atts = shortcode_atts( array(
        'id'          => '',
        'rel'         => '',
        'class'       => '',
        'href'        => '',
        'title'       => '',
        'target'      => '',
        'style'       => '',
        'amount'      => 0,
        'ctype'       => 'mycred_default',
        'min_balance' => 0,
        'hreflang'    => '',   // for advanced users
        'media'       => '',   // for advanced users
        'type'        => ''    // for advanced users
    ), $atts );

    // Check minimum balance requirement
    if ( $atts['min_balance'] > 0 && is_single() ) {

        global $post;
        $mycred = mycred( $atts['ctype'] );
        $author_id = $post->post_author;
        $balance = $mycred->get_users_balance( $author_id, $atts['ctype'] );

        // If balance is lower than the limit we return nothing.
        if ( $balance < $mycred->number( $atts['min_balance'] ) )
            return '';

    }

    // Let myCRED run the mycred_link shortcode.
    return mycred_render_shortcode_link( $atts, $content );
}