Try click+holding on this icon. You can drag them. The feature is pretty hidden, though 😅

Sendgrid it is for me.

With Stripe Billing, you can configure both a one-time fee and a subscription fee based on units of usage (which, in your case, would be amount of days). Also supports SEPA: stripe.com/docs/billing/subsc…
Requires more programming than Stripe Checkout, though. But with the documentation and examples, you should manage to get it working relatively quickly.

Pinned browser tab almost exclusively. Sometimes telegram bot.

JS (VueJS and BootstrapVue) + Firebase (NodeJS)

+1, go-to choice.

Agree with all points as well.

One thing that is a little unknown but good to be aware of: On windows, one can use the "windows key + dot" to make the emoji pop-up appear.