Generate API keys to access your transactional email templates programmatically.
Learn about API keys and how they enable you to access transactional email templates programmatically.
API keys are secure tokens that allow your applications to authenticate with Letter's API. They're required to access your transactional email templates and send personalized emails.
Convert any newsletter into a transactional template that can be accessed via API. These templates support dynamic variables and can be personalized for each recipient.
, then mark any newsletter as "transactional" in the editor. You'll be able to access it via API with your key and template ID.
