Checkout: forward only the checkout fields, show clear errors, fix the contact form (#16)

Co-authored-by: Michael Czechowski <mail@librete.ch>

composables/useShopApi.ts

@@ -9,6 +9,7 @@ import type {
 	PaymentMethod,
 	ApiResponse
 } from "~/types";
+import type { AlreadyCaptured } from "~/utils/captureResponse";
 
 /**
  * Shop API composable.
@@ -116,8 +117,9 @@ export function useShopApi() {
 			});
 		},
 
-		async capturePayment(uuid: string, paypalOrderId: string): Promise<Order> {
-			return await $fetch<Order>(`/api/orders/${uuid}/capture/${paypalOrderId}`, {
+		/** The paid order, or { success: true, alreadyCaptured: true } when an earlier capture of this PayPal order went through. */
+		async capturePayment(uuid: string, paypalOrderId: string): Promise<Order | AlreadyCaptured> {
+			return await $fetch<Order | AlreadyCaptured>(`/api/orders/${uuid}/capture/${paypalOrderId}`, {
 				method: "POST"
 			});
 		},