Issues setting up PayPal with UniFi in UK

[BaxbyHideaway]

I have purchased UniFi for my business and everything works fine with the Sandbox account but as soon as I enter the API Username, password and Signature to go live and after entering payment details via the guest portal it just says Connection error, please check you have entered your card details correctly (which I have).

Has anyone got any tips on this, or managed to get it to work in the UK?  I have sent HOURS trying to get it to work.

I have a PayPal business account.

Thank you

Barney

[BaxbyManor]

Thanks for your update.  I still have made no progress and may in fact give up! LOL