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So a nice group effort on this one in slack. The first suggestion was the old favorite var_dump, but it was not practical as it was a third party calling in and no idea on the timing.
The next option- logging. Tom mentioned https://docs.expressionengine.com/latest/development/legacy/libraries/logger.html which makes something like this easy:
ee()->load->library('logger');
$payload = print_r($post_var, trus);
ee()->logger->developer($payload);
Ultimate, the tool being sought was https://webhook.site/
> Webhook.site - Test, process and transform emails and HTTP requests > Instantly generate a free, unique URL and email address to test, inspect, and automate (with a visual workflow editor and scripts) incoming > HTTP requests and emails
With https://ngrok.com/docs/getting-started/ as another popular alternative.
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