This is correct. I am still able to do refunds as of now. I have a workload in place to do "exchanges" and create a PAY token for additional charges. The IPN return does everything right in the sandbox as of the last time I checked it. IN LIVE mode though something is wrong. Says the credentials are incorrect yet not when using this path for refunds. I'm trying to think through how to use a new path to do this but don't see it as clean and consumer awareness correct. I haven't ran the PAY in the sandbox in a very long time for it was working. Takes so much to set up a fake transaction. I just recently went LIVE.
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