I want to share Tips about HTTP Webhook action of HTTP connector.
I research these Tips about "Callback url" output of this action.

Question: What is the "HTTP Webhook" action?
Answer: This action request a HTTP system and automatic a HTTP url as "Callback url".
Question: What is the "Callback url"?
Answer: Autocreated url for request by target system.
Question: How to use the "Callback url"?
Answer: 1st flow, and 2nd flow scenarios.
1st flow use the "HTTP Webhook" action to call 2nd flow, and pass "Callback url" to 2nd flow
2nd flow use the "HTTP request" action, which "Uri" is the "Callback url" after something complete in the 2nd flow.
1st flow continue something after 2nd flow action.
Question: Dose the "Callback url" each time of this action use?
Answer: Yes, the "Callback url" change each time at this action use.
Question: What happen the "Callback url" call two or more times?
Answer: Error. the HTTP request to "Callback url" is success only onet time, and second time or more is error
Question: What defference between "HTTP" action and "HTTP Webook" action?
Answer: there are "Callback url" output. "HTTP" action dose not output it, "HTTP Webhook" action dose output it. and "Unsubscribe" features.
and Nice video "Using Flow as a Function" by MattWeston365

Regards,
Yoshihiro Kawabata