The Paypal error 4003 (when receiving PDT) could happen the server is doing too many requests/validations for the same "tx" (transaction id) with a cmd=_notify-synch. Paypal will not send back the data after about 5 requests.
Sometimes the error could happen randomly in sandbox. This shouldn't happen in "live".
Sometimes the error could happen randomly in sandbox. This shouldn't happen in "live".
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