Hi there @mcxprints,
MailPoet doesn’t currently include any functionality for generating coupons in WooCommerce. While you can include an already created coupon code (shared across users) in a welcome email, there’s no way to automatically create a new/unique one for each user that signs up.
There’s an open feature request for this on our feedback board here — it would be great if you could add your vote to the request to show your support:
In the meantime, you could try creating a custom shortcode and generating the coupon in PHP code, then using the shortcode in your email to display the code. We have a guide for creating custom MailPoet shortcodes here:
If you need help with custom code, we recommend reaching out to someone from Codeable: https://codeable.io