6

You can reference this payload in the Postmark Batch API documentation. You can customize the “To” email and insert the proper merge tag via the “TextBody” and “HtmlBody”

[
  {
    "From": "sender@example.com",
    "To": "receiver1@example.com",
    "Subject": "Postmark test #1",
    "TextBody": "Hello dear Postmark user.",
    "HtmlBody": "<html><body><strong>Hello</strong> dear Postmark user.</body></html>",
    "MessageStream": "outbound"
  },
  {
    "From": "sender@example.com",
    "To": "receiver2@example.com",
    "Subject": "Postmark test #2",
    "TextBody": "Hello dear Postmark user.",
    "HtmlBody": "<html><body><strong>Hello</strong> dear Postmark user.</body></html>",
    "MessageStream": "outbound"
  }
]