invoke-payload.json

{
	"fromMail": "example@mail.com",
  "fromName": "Example Name",
	"to": "another@example.com",
	"subject": "This is an example",
	"bodyText": "My go-sendmail example!",
	"bodyHtml": "<h1>Hi there from go-sendmail!<h1>",
	"customArgs": {
    "Identifier": "123456789-0",
    "Type": "example-type",
    "Key": "Value",
    "foo": "bar"
  }
}