This request will return a subset of all your transactional mails groups. Use the page and count parameters to get the whole list. You can include the order, direction and filter variables to affect the list you receive as request variables.
Your URL is the address of your Everlytic install.
Your method must be structured as follows:
ListTransactionalGroups(string $search, int $page, int $count, string $order, string $direction) : array