Merge pull request #21556 from overleaf/em-subscription-change-interstitial

Add-on purchase preview page

GitOrigin-RevId: 660e39a94e6112af020ea783d6acf01a19432605

services/web/types/currency-code.ts

@@ -0,0 +1,18 @@
+export type CurrencyCode =
+  | 'AUD'
+  | 'BRL'
+  | 'CAD'
+  | 'CHF'
+  | 'CLP'
+  | 'COP'
+  | 'DKK'
+  | 'EUR'
+  | 'GBP'
+  | 'INR'
+  | 'MXN'
+  | 'NOK'
+  | 'NZD'
+  | 'PEN'
+  | 'SEK'
+  | 'SGD'
+  | 'USD'

services/web/types/subscription/subscription-change-preview.ts

@@ -0,0 +1,38 @@
+export type SubscriptionChangePreview = {
+  change: SubscriptionChange
+  currency: string
+  paymentMethod: string
+  immediateCharge: number
+  nextInvoice: {
+    date: string
+    plan: {
+      name: string
+      amount: number
+    }
+    addOns: AddOn[]
+    subtotal: number
+    tax: {
+      rate: number
+      amount: number
+    }
+    total: number
+  }
+}
+
+type AddOn = {
+  code: string
+  name: string
+  quantity: number
+  unitAmount: number
+  amount: number
+}
+
+type SubscriptionChange = AddOnPurchase
+
+type AddOnPurchase = {
+  type: 'add-on-purchase'
+  addOn: {
+    code: string
+    name: string
+  }
+}