Hi, I need help with sending http request to vapi. I am trying it from last 4 hours with different json formats but i get the same bad request error, watched a lot of youtube videos but still same error. This is my json body format: { "phoneNumberId": "{{ $('Code1').item.json.phoneNumberId }}", "assistantId": "{{ $('Code1').item.json.assistantId }}", "customer": { "number": "{{ $('Code1').item.json.customer.number }}" }, "metadata": { "email": "{{ $('Code1').item.json.assistantOverrides.variableValues.email }}", "name": "{{ $('Code1').item.json.assistantOverrides.variableValues.firstName }}" } } Also is it the reason that i am trying to call to the uknumber which vapi doesn't allow using us number.