SAAS promotional & Transactional emails

Hi,

For my SAAS, I am using Firebase for authentication and Stripe for payments. Right now, I do not send any promotional or transactional emails but I am planning to add support

My use cases are super simple -

1. Signup Complete - Send Welcome email
2. Abandoned cart - Send promotional email
3. Payment declined - Send Decline payment email and offer a promo code
4. Send promotional emails on feature releases.

Setting up such infrastructure requires listening to Stripe Webhook responses, create firebase listeners, write code to send emails, sync contacts etc - which is a lot of work. I am a developer and have a fair bit idea of how to do it, but I don't have time.

So, Is there a no-code or low-code tool that will let me trigger emails based on the stripe/firebase state?