Paypal registration lost after transfer to sub-domain

[ChandigarIT]

I had installed the PayPal module in PrestaShop 1.7.8.7, linked it to the Paypal Account, and registered it.

I transferred the whole shop from www.mydomain.com to store.mydomain.com and this was successful apart from one item - the PayPal module.

This is now saying that the module needs linking to the PayPal account, and I don't want the hassle of trying to get someone n another county to press the correct buttons on their mobile if I can avoid it.

Has anyone else come across this, and is there a way to recover the information?

Thanks in advance.