An email can now carry headers of your own, such as a tag your mail system reads back later. Add a headers map to a send and Samva copies it onto the message.
What you need to do. Nothing, unless you want a header. One email takes up to 11, and a name Samva writes itself, like From, is rejected with a 422 that names it. In the CLI, repeat --header 'Name: Value'.
await samva.email.send({
to: "ada@example.com",
subject: "Your sign-in code",
text: "Your code is 123456.",
headers: { "OTP-Token": "123456" },
});