V2 Payment Features (#4974)

* Added ability to add seats to enterprise
* first logged in date on people page
* Remove Premium config section				
* Cleanup add seat flow					
* Shrink numbers in plan 					
* Make editing text a server feature in the highlights
* default to dollar pricing				
* clear checkout logic when crash				
* Recongnise location and find pricing			
* Payment successful page

---------

Co-authored-by: Connor Yoh <[email protected]>

frontend/src/proprietary/services/licenseService.ts

@@ -43,6 +43,7 @@ export interface CheckoutSessionRequest {
   current_license_key?: string; // Current license key for upgrades
   requires_seats?: boolean; // Whether to add adjustable seat pricing
   seat_count?: number;      // Initial number of seats for enterprise plans (user can adjust in Stripe UI)
+  email?: string;           // Customer email for checkout pre-fill
   successUrl?: string;
   cancelUrl?: string;
 }
@@ -109,7 +110,7 @@ const licenseService = {
   /**
    * Get available plans with pricing for the specified currency
    */
-  async getPlans(currency: string = 'gbp'): Promise<PlansResponse> {
+  async getPlans(currency: string = 'usd'): Promise<PlansResponse> {
     try {
       // Check if Supabase is configured
       if (!isSupabaseConfigured || !supabase) {
@@ -320,6 +321,7 @@ const licenseService = {
         current_license_key: request.current_license_key,
         requires_seats: request.requires_seats,
         seat_count: request.seat_count || 1,
+        email: request.email,
         callback_base_url: baseUrl,
         ui_mode: checkoutMode,
         // For hosted checkout, provide success/cancel URLs
@@ -443,6 +445,42 @@ const licenseService = {
       throw error;
     }
   },
+
+  /**
+   * Update enterprise seat count
+   * Creates a Stripe billing portal session for confirming seat changes
+   * @param newSeatCount - New number of seats
+   * @param licenseKey - Current license key for authentication
+   * @returns Billing portal URL for confirming the change
+   */
+  async updateEnterpriseSeats(newSeatCount: number, licenseKey: string): Promise<string> {
+    // Check if Supabase is configured
+    if (!isSupabaseConfigured || !supabase) {
+      throw new Error('Supabase is not configured. Seat updates are not available.');
+    }
+
+    const baseUrl = window.location.origin;
+    const returnUrl = `${baseUrl}/settings/adminPlan?seats_updated=true`;
+
+    const { data, error } = await supabase.functions.invoke('manage-billing', {
+      body: {
+        return_url: returnUrl,
+        license_key: licenseKey,
+        self_hosted: true,
+        new_seat_count: newSeatCount,
+      },
+    });
+
+    if (error) {
+      throw new Error(`Failed to update seat count: ${error.message}`);
+    }
+
+    if (!data || !data.url) {
+      throw new Error('No billing portal URL returned');
+    }
+
+    return data.url;
+  },
 };
 
 /**