PUT
/v3/grants/{grant_id}/templates/{template_id}Update a template
Updates the specified grant-level template.
Update template request
/v3/grants/{grant_id}/templates/{template_id}Updates the specified grant-level template.
ID of the grant to access. You can also use the email address associated with the grant, or use
/me/ to refer to the grant associated with an access token.
"[email protected]"Update template request
"<p>Hello {{user.name}}, your booking has been confirmed.</p>"