curl --request POST \
  --url https://api-ai.textyess.com/webhooks/flows/68dd9a79dd6e8f8774733bd7 \
  --header 'Content-Type: application/json' \
  --header 'x-flow-token: your_flow_token' \
  --data '{
    "phone_number": "+393475156348",
    "country_code": "IT",
    "first_name": "John"
  }'

curl --request POST \
  --url https://api-ai.textyess.com/webhooks/flows/68dd9a79dd6e8f8774733bd7 \
  --header 'Content-Type: application/json' \
  --header 'x-webhook-secret: your_webhook_secret' \
  --data '{
    "phone_number": "+393475156348",
    "country_code": "IT",
    "first_name": "John"
  }'

{
  "success": true,
  "workflowId": "wf_12345678"
}

{
  "message": "Webhook payload missing required fields",
  "errors": ["phone_number requires country_code"],
  "hint": "Webhook payload must include email or phone_number (country_code is required when phone_number is set)"
}

{
  "message": "Invalid webhook secret"
}