Hi, I am receiving various errors saying the API is rejecting properties that should be able to be included in my assistant. I am getting these errors in MAKE.com when calling via HTTP DataError Error: 400 Bad Request {"message":["assistant.property smartEndpointingplan should not exist","assistant.voicemailDetection.property backOffPlan should not exist"],"error":"Bad Request","statusCode":400} Origin HTTP @Sahil

can you send the complete CURL request?

It looks like the API is rejecting your request due to incorrect property names. Make sure you use the correct casing and structure. For example, use

smartEndpointingPlan

(not

smartEndpointingplan

) and

backoffPlan

(not

backOffPlan

). Here’s a minimal example of how these should look in your JSON:

json
{
  "startSpeakingPlan": {
    "smartEndpointingPlan": { "provider": "vapi" }
  },
  "voicemailDetection": {
    "provider": "google",
    "backoffPlan": { "startAtSeconds": 1.1 }
  }
}

Update your payload accordingly and try again. Reference: [Vapi Changelog May 3, 2025](https://docs.vapi.ai/changelog/2025/5/3), [Speech Configuration](https://docs.vapi.ai/customization/speech-configuration) Sources: - [Vapi Changelog May 3, 2025](https://docs.vapi.ai/changelog/2025/5/3) - [Speech Configuration](https://docs.vapi.ai/customization/speech-configuration)

HI @Sahil is this what you need ( I recently took out the properties that were giving an error) :

I sent you my Calendly link. Let's schedule a quick call to sort this out.

thank you I'll schedule

Please reach out to us if you have any other questions regarding this issue