/**
 * Set Content for Sale by Author
 * @mycred
 * @version 1.0
 */
add_filter( 'mycred_post_is_for_sale', 'mycredpro_set_for_sale_by_author', 10, 2 );
function mycredpro_set_for_sale_by_author( $result, $post ) {

	if ( $post->post_author == 123 )
		return true;

	return $result;

}