CardSave setup problems

-- url of the page with the problem -- : mywebsite.com/administrator/index.php?op...ikashop&ctrl=plugins
-- HikaShop version -- : 2.2.2
-- Joomla version -- : 3.1.1
-- PHP version -- : 5.4.12

I'm having problems setting up the CardSave payment plugin to pass the correct arguements to CardSave to make a transaction at checkout. CardSave website (when using 'hosted' API) reports back "HashDigest does not match", but I've exhausted seeing what I may have done wrong with the plugin configuration screen and certain I have correct merchant number, password, and Shared key.

However something that does concern me is that everytime I open the Plugin:CardSave configuration page through the "payment methods" screen, I get a message at the top saying "You need to enter your CardSave Shared Key". If you don't have a CardSave account yet, you can create a new account by clicking here".
But the key is in there and if I change it, it does save the amendment when I return back to that page. I'm suspicious perhaps the backend code doesn't see it hence creating a bad hashdigest.

I'm not experienced with this type of stuff, mainly wondering what I can do next, or get advised of other possible causes for that error message Thanks

Thanks Jerome for confirming the error message wasn't valid. At least i knew i didn't have to worry about that part. I ended up changing the cardsave password several times, reinstalling hikashop completely and clearing all the SQL tables, & some other stuff. Nothing worked. Then today I tried changing the cardsave password one last time on the card save website and it all of a sudden it worked!?

Tempted to think the card save website wasn't changing the passwords last week as it should have, but I'll probably never know for sure.

Cheers

Jemal