This CRM has two endpoints:

1. /subscribe.php
2. /unsubscribe.php

Send a POST request to the respective endpoint with at least an email field in the form payload. The subscribe endpoint can also accept a name and birthday property if desired, but those can optionally be left out of the payload.

• The tool writes to crm.csv by default. It is recommended to change the name of the file to something random for security reasons. Important! Be sure to update the hardcoded references to the filename in both subscribe.php and unsubscribe.php.
• This system works really with SerialMailer 8's remote CSV import feature if you need an inexpensive bulk email sender for macOS.