I'm using the Pay Per View plugin for a WordPress site. After spending 2 hours with their customer support they claim it's a PayPal issue as they don't have any problems. Researching this error says the wrong credentials are being used. I've check them multiple times, I've had other people verify the correct ones are copied and it's still not working. I've tried both the Sandbox (which doesn't give you an Identity Token) and Live. Both fail with the same error. Any ideas?
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