Weebly Website - "Security header is not valid" after Refund - ISSUE!

[Fallschirmjager]

Hi Weebly People

I'm getting the following message on my website when I try to issue a partial refund to the customer: 

"Refund for £X.XX was attempted, but failed. The payment processor supplied the following message: "Security header is not valid""

I have tried this on two different orders and I get the same message. On googling it seems like an API Error. Both Transactions were through PayPal.

Just wondering if others are getting this as ideally it really needs resolving!

Thanks Mike

[Fallschirmjager]

This now appears to be fixed - I disconnected paypal and reconnected paypal so not sure if Weebly support did anything in the background or if this was a coincidence - anyway it is all OK Now!