This code snippet will limit the number of times a post can be purchased. Once a post reaches the limit, the content will no longer be set for sale but be visible.

Max Content Purchases

/**
 * Disable Content Sales
 * Disabled content sales after 3 purchases.
 * @version 1.0
 */
add_filter( 'mycred_add', 'mycred_limit_content_sales', 10, 3 );
function mycred_limit_content_sales( $reply, $request, $mycred ) {
	// Only apply this to content purchases
	if ( $reply === false || $request['ref'] != 'buy_content' ) return $reply;

	// The post id
	$post_id = absint( $request['ref_id'] );

	// The maximum number of times a post can be bought
	$max = 3;
	
	// Check the log for number of sales of this post
	global $wpdb;
	$count = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM {$mycred->log_table} WHERE ref = %s AND ref_id = %d;", 'buy_content', $post_id ) );
	
	// If this is the last purchase, disable sales now
	if ( $count+1 >= $max ) {
		$prefs = get_post_meta( $post_id, 'myCRED_sell_content', true );
		$prefs['status'] = 'disabled';
		update_post_meta( $post_id, 'myCRED_sell_content', $prefs );
	}

	// Always return something
	return $reply;
}

Hello! I am having troubles getting this to work on my website. I have inserted it in my themes functions file and changed the $max=3 to 1, but it does not limit the purchases using points.

Would you be able to tell me if I am doing something wrong?

Same here, this code doesn't seem to work anymore. Please update ! :)