Royal Mail Api Integration - Uk Couriers

Hi guys,
Is there anyone who tried to integrate the Royal mail API to Cs-cart to be able to use with Click & Drop?

Or maybe you can recommend any helpful addon that will help to have UK curriers in CS-cart?

I'll appreciate any help or advice.

Old post I know but Im trying to use shippy pro without much success connecting, does anyone have an addon yet that could help