Please help with REST API not work

I use React and WordPress headless API, I install Contact Form 7 with the expectation to use it as REST API to submit my contact form. I just simply used posman to test API first, but it got error

{
“code”: “wpcf7_unsupported_media_type”,
“message”: “The request payload format is not supported.”,
“data”: {
“status”: 415
}
}

call API: https://api.ausk.vn/wp-json/contact-form-7/v1/contact-forms/25/feedback

body:

{
“your-name”: “John Doe”,
“your-email”: “[email protected]”,
“your-message”: “This is a test message”
}

The page I need help with: [log in to see the link]