When creating a webhook, the error "Value isn't a string."

Hello everyone, I am creating a webhook, but I ran into a problem when specifying the list ids in the idModel, the API returns the error “Value isn’t a string.”, Here is my request.

"description":"listener on first board",   
"idModel" : "60fffb08736bcf7bf0b0a3ae",    
"callbackUrl" : "https://8441a48e1030.ngrok.io/trello/",    
"key" : key,    
"token" : token

What are you using to make the HTTP request - Postman, node, fetch, etc.?

@AndreiSkripnikov - You could try using this.

I had the same problem and solved it by using the key callbackURL. Note that it’s with capital URL.

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