title: Using WhatsApp API to find out if a number has an account
body: <p>I'm trying to use the WhatsApp API, especially "POST /v1/contacts" at this url "<a href="https://developers.facebook.com/docs/whatsapp/api/contacts/" rel="nofollow noreferrer">https://developers.facebook.com/docs/whatsapp/api/contacts/</a>".</p>
  
  <p>But actually I don't know which url to use, I tried "<a href="https://api.whatsapp.com/v1/contacts" rel="nofollow noreferrer">https://api.whatsapp.com/v1/contacts</a>" but I got a 404 Not Found Status.</p>
  
  <p>I do my queries on postman.</p>
  
  <p>Has anyone ever used it.</p>
  
  <p>Thank you. </p>