php - Error ???Media type 'application/json' is not supported??? Api GMAIL

I am doing an exercise to learn how to use the GMAIL api, as an example I am trying to send a message by mail, but it sends me the following error "Media type 'application / json' is not supported". Could you support me to track down the bug and be able to fix it?

Postman configuration.

https://developers.google.com/gmail/api/reference/rest/v1/users.messages/send

Greetings and excellent Friday

Solution:

Your message ressource must be a base64url encoded string

For testing purposes, you can use any online base64url encoder and than assign the encoded string to "raw" with the Try this API.

Once you get the request right, it will be easier for you to transfer it into your specific environment.