feat(billing): issue the license from Stripe, not only from the thank-you page

.env.examplemodified+2-0

Changes to .env.example

		⋯34 linesShow the 34 lines above this hunk@@ -35,6 +35,8 @@ DB_USERNAME=root
35	35	DB_PASSWORD=
36	36
37	37	STRIPE_SECRET_KEY=""
	38	+# Signing secret for the /api/billing/webhook endpoint, from the Stripe dashboard.
	39	+STRIPE_WEBHOOK_SECRET=""
38	40
39	41	AWS_ACCOUNT_ID=
40	42	AWS_ACCESS_KEY_ID=