Sandbox Merchant ID: <Removed>
IPN was working perfectly until August 18, then it just stopped. All payment transactions are going through both the client and the business accounts, but there is nothing in the IPN history about any IPN message being sent.
We have tested thoroughly, including resending an old IPN that had worked previously - nothing happened. We have turned the IPN off and on again in Paypal sandbox.
I see from previous posts that this was a known issue in February and July of 2020. Is this happening again, or is there something we can do with this account to fix it? Would creating a new sandbox account help?
