SendGrid API V3 returns 400 Bad Request
<p>I am trying to achieve send of mail via <a href="https://sendgrid.com/docs/API_Reference/Web_API_v3/index.html" rel="noreferrer">SendGrid API</a>.</p>

<p>Following is the JSON I am sending as a body of the POST Method</p>

<pre><code>{
  "content" : [
    {
      "type" : "text\/plain",
      "value" : "Hello, World!"
    }
  ],
  "personalizations" : [
    {
      "to" : [
        {
          "email" : "sahpranav1712@gmail.com"
        }
      ],
      "subject" : "Hello, World!"
    }
  ],
  "from" : {
    "email" : "iospranav1712@gmail.com"
  }
}
</code></pre>

<p>and following is the return that I am getting</p>

<pre><code>{"message":"Bad Request","field":null,"help":null}
</code></pre>

<p>This piece of info doesn't help much.</p>

<p>The authorization is in place, and I believe correctly. </p>

<p>Perhaps, I might have missed some sort of settings in the <a href="https://app.sendgrid.com/" rel="noreferrer">SendGrid App</a></p>

<p>If it helps im using Objective-C.</p>

<p>Please help!!</p>