https://tls.lnlink.org/?d=ASED88EIzNU2uFJoQfClxYISu55lhKHrSTCA58HMNPgtrXECcHJveHkubG5saW5rLm9yZy9tb25hZC5lbmRwb2ludC5qYjU1LmNvbQADYAego9kAnmQBTmdZ0uqhrkXuFX-qs8CckOUKN29B0bf8PTEyMCZtZXRob2Q9aW52b2ljZXxtZXRob2Q9d2FpdGludm9pY2UmcG5hbWVsYWJlbF5sbmxpbmstJnJhdGU9OAREZWF0aCBTdGFyAAZBbiBvYmplY3Qgb2YgdW5mYXRob21hYmxlIHBvd2VyLiBQbGVhc2UgZW50ZXIgeW91ciBhZGRyZXNzIGZvciBkZWxpdmVyeS4ABwIIaHR0cHM6Ly91cGxvYWQud2lraW1lZGlhLm9yZy93aWtpcGVkaWEvZW4vZi9mOS9EZWF0aF9zdGFyMS5wbmcACgAAAV4%3D

These are like stripe payment links but they require no server, only a c-lightning node. All the data in the page is contained in the URL, so you can put these in a shopify “pay now” invoice email and it just works.