checkoutErrorMessage (utils/checkoutError.ts) maps the status and body of a
failed request, the shop's answer or a raw CMS (Strapi) error, to one fixed
message for the customer, addressed with "du": an invalid e-mail address
(when data.email is among the rejected fields), other invalid input, an order
already paid, a product no longer available, an order not ready for checkout
(naming the missing steps), a payment that does not fit the order or an order
changed during the payment ("Bitte starte die Zahlung neu"), PayPal not
reachable ("versuche es in ein paar Minuten noch einmal"), a payment PayPal
may have taken that the CMS could not confirm or record ("Bitte bezahle nicht
noch einmal"), and a general fallback. It never shows the server's text.
Steps 1 and 2 show the message above their submit button, in the style of
step 3's payment error, instead of logging the error only. Step 3 shows it
for a failed PayPal order creation or capture. The e-mail input of step 1 is
type="email" (Input.vue takes a type).
Refs libretech/mp#71
libretech
8931afc670