Tips for webhook debugging?

[BDub]

If it's not JSON or FORM encoded... then it's likely a QUERY. Check out this example:

[Webhooks] Super Simple Motion Activated Push Notifications

You are about to witness the power of the Particle Cloud like you’ve never seen before! Say you want to use a Motion Sensor to send yourself a Push Notification every time someone enters your office. Would you believe me if I told you all you needed was 4 lines of code? No really! I wouldn’t lie to you webooks-push.ino void setup() { pinMode(D0, INPUT); } void loop() { if (digitalRead(D0) == HIGH) { Particle.publish("office-motion", "OFFICE", 60, PRIVATE); …

...dump the HTTP request that the Particle Cloud makes?

Not currently

Monitor responses:
http://docs.particle.io/photon/webhooks/#handling-web-responses

10 consecutive errors will disable your webhook:
http://docs.particle.io/photon/webhooks/#errors