Validating Server to Server Endpoint URL

Jon1989 · May 28, 2025, 10:49am

Format Your New Topic as Follows:

API Endpoint(s) and/or Zoom API Event(s)
Link the API endpoint(s) and/orZoom API Event(s) you’re working with to help give context.

Endpoint URL Validation

Description
Details on your question, workflow or the problem you’re trying to solve.
I’m trying to validate a Power Automate Endpoint URL. However it will not validate. I’ve used a webhooksite tester URL and that validates fine, however the power automate URL will not validate.
From other topics I’ve found that you must set a custom Auth header & must set up a response for the CRC However even after setting these up Validation is still failing.

Error?
The full error message or issue you are running into, where applicable.

When selecting Validate I get the following Error:
URL validation failed. Try again later.

How To Reproduce
Steps to reproduce the behavior:
1. Request URL / Headers (without credentials or sensitive info like emails, uuid, etc.) / Body
Validate Request sent to Power Automate:
{
“payload”: {
“plainToken”: “CaA4i4GMT6qugjVidrb6HQ”
},
“event_ts”: 1748362518271,
“event”: “endpoint.url_validation”
}
Response Sent to Zoom:
{
“statusCode”: “200”,
“headers”: {
“Content-Type”: “application/json”
},
“body”: {
“plainToken”: “CaA4i4GMT6qugjVidrb6HQ”,
“encryptedToken”: “a0d33113947ed01b99050e11585ca4ffd1f28151dfcad979be36b60da8d753b9”
}
}
2. Authentication method or app type
3. Any errors

Any help, or an example response i can reverse enginnerr would be appreciated

elisa.zoom · May 29, 2025, 5:37pm

Hey @Jon1989
Thanks for reaching out to us!
Have you had a chance to review our sample app?

github.com/zoom/webhook-sample

index.js

master


      
          console.log(req.body)
          
          // construct the message string
          const message = `v0:${req.headers['x-zm-request-timestamp']}:${JSON.stringify(req.body)}`
          
          const hashForVerify = crypto.createHmac('sha256', process.env.ZOOM_WEBHOOK_SECRET_TOKEN).update(message).digest('hex')
          
          // hash the message string with your Webhook Secret Token and prepend the version semantic
          const signature = `v0=${hashForVerify}`
          
          // you validating the request came from Zoom https://marketplace.zoom.us/docs/api-reference/webhook-reference#notification-structure
          if (req.headers['x-zm-signature'] === signature) {
          
            // Zoom validating you control the webhook endpoint https://marketplace.zoom.us/docs/api-reference/webhook-reference#validate-webhook-endpoint
            if(req.body.event === 'endpoint.url_validation') {
              const hashForValidate = crypto.createHmac('sha256', process.env.ZOOM_WEBHOOK_SECRET_TOKEN).update(req.body.payload.plainToken).digest('hex')
          
              response = {
                message: {
                  plainToken: req.body.payload.plainToken,
                  encryptedToken: hashForValidate

Jon1989 · May 29, 2025, 9:01pm

Hi Elisa,
Thanks for the response. I’ve managed to resolve the issue.
The issue was with my hash function not outputting the correct value as it was using the secret key as a string instead of the byte value.

Thanks again,

Jon

elisa.zoom · May 30, 2025, 4:30pm

Thank you so much for sharing your findings with the Community! @Jon1989

system · May 31, 2025, 4:31pm

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Validating Server to Server Endpoint URL

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