Exp:resso Store v1.6.5 on ExpressionEngine v2.10.2
I have an integration using PayPal Express working just fine with callbacks, however with WorldPay as alternative payment provider, there's an error on the callback:
Error reported: Callback to http://www.example.com/?ACT=24&H=8fbe37725478025650b33d945595c1cc: NOT OK, received HTTP status: 403
HTTP/1.1 403 Forbidden This form has expired. Please refresh and try again.
The data going from WorldPay to EE looks OK but the callback URL isn't functioning correctly.
A successful upgrade of EE from 2.9.2 to v2.10.2 did not resolve the issue.
Any ideas? Thanks.