Thanks for the feedback. Everything was processed fine, but looks like their was a delay more than 5 minutes before submitting the donation info. Please ignore this email, we are extending the time period to prevent this email from being sent prematurely.
After doing so I received an email saying my registration was incomplete and the email gave a link to complete my registration.
Clicking back through to pay with a post it looks like they still have my registration.
Maybe the email is going out prematurely before you have a chance to receive a webhook from pay with a post?