{ "api_key": "api-40246460336B11E6AA53F23C91285F72", "to": ["Test Person <test@example.com>"], "sender": "Test Persons Friend <test2@example.com>", "subject": "Hello Test Person", "text_body": "You're my favorite test person ever", "html_body": "<h1>You're my favorite test person ever</h1>", "custom_headers": [ { "header": "Reply-To", "value": "Actual Person <test3@example.com>" } ], "attachments": [ { "filename": "test.pdf", "fileblob": "--base64-data--", "mimetype": "application/pdf" }, { "filename": "test.txt", "fileblob": "--base64-data--", "mimetype": "text/plain" } ] }Thank you.