API Expert and WordPress Plugin Customization - Clickbank, GetResponse, Wishlist Membership Site Integration

I'm looking for a talented programmer and wordpress plugin developer to resolve an issue I am having with integrating a number of platforms.

Customers buy my products from Clickbank (CB) and from CB they are then sent to my membership site to access their products via Wishlist Member (WL) - wordpress plugin) - they are also added to the respective Getresponse (GR) campaign.

I have purchased an extra plugin from HappyPlugins to help with this, though it's not working properly.  It's supposed to auto-register the customer to make the purchased product access easier - less steps - though it seems to be broken (it was working).

I have a personal development business and have created 4 online programs. I'm also an affiliate marketer.

I need a brilliant API expert to sort out this issue! Can you help? This is an advanced job. You must be brilliant at customising and making APIs work like magic.

I have used a few people who have not been successful in sorting this out - though I know if can be done with the right person.

So let's not waste anyone's time - you must be highly skilled in this area as this issue is CRITICAL - TIME SENSITIVE.

A little more information...

When the plugins were working there was still an issue - I believe this is a complicated issue. Some people were being added to the GetResponse campaign while others were not - I did not manage to fix this.

We have added a Getresponse/Clickbank integration to help this on one account though this has not been added to another Clickbank account which has 4 products - this integration is more complicated as I believe some tags need to be added for this so that the customers are being to the correct campaign (one of 4).

And when themes and plugins are updated all seems to break - I need someone to keep an eye on this. ??Are you able to do this?

I would love someone who I can have a long-term working relationship with. Someone reliable and easy to communicate with.

Thank you,
Nadine