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For 2days now I've got the following message
This action isn't supported. Please return and report this error so that we can support it in the future. (invalid client_ID or redirect_uri)
Can't pay for anything!!
I'm sorry to hear that you're getting an error message in the eBay checkout. If this is continuing, please try clearing cookies and cache in your browser. If it continues past that, please visit http://www.paypal-support.com and log in and create a ticket for our technicians to look into.
Thank you for posting!