Neu AmazonPay Problem beim Click auf den Button

[Spirits77]

Hallo zusammen,

ich habe mir ganz frisch das AmazonPay Checkout V2 Plugin installiert, nachdem ich für AmazonPay alles konfguriert hatte.

Der Button auf der Artikeldetailseite erscheint, aber beim Klick gehts nicht weiter und ich bekomme diese Meldung in der Console:

Access to XMLHttpRequest at 'https://www.meinedomain.de/io.php' from origin 'https://www.meinedomain.de' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
plugin_js_head,jtl3.js?v=3.04:174

Arguments(3) ['handleError', 'error', '', callee: (...), Symbol(Symbol.iterator): ƒ]
error @ plugin_js_head,jtl3.js?v=3.04:174
handleError @ plugin_js_head,jtl3.js?v=3.04:249
error @ plugin_js_head,jtl3.js?v=3.04:247

POST https://www.meinedomain.de/io.php net::ERR_FAILED
send @ jquery-1.12.4.min.js:4
ajax @ jquery-1.12.4.min.js:4
request @ plugin_js_head,jtl3.js?v=3.04:247
call @ plugin_js_head,jtl3.js?v=3.04:247
n @ lpa.min.js?v=120:1
(anonym) @ lpa.min.js?v=120:1
createCheckoutSession @ lpa.min.js?v=120:1
to @ checkout.js:1
(anonym) @ checkout.js:1
En @ checkout.js:1
(anonym) @ checkout.js:1
co @ checkout.js:1
(anonym) @ checkout.js:1
(anonym) @ checkout.js:1

Uncaught (in promise) true
Promise.then (asynchron)
to @ checkout.js:1
....