diff --git a/components/PricingSection.tsx b/components/PricingSection.tsx
index abe8c1d..3d6c276 100644
--- a/components/PricingSection.tsx
+++ b/components/PricingSection.tsx
@@ -109,7 +109,7 @@ export default function PricingSection() {
   const [loadingPlan, setLoadingPlan] = useState<string | null>(null)
   const { user } = useAuth()
 
-  // * Show toast when redirected from Polar Checkout with canceled=true
+  // * Show toast when redirected from Mollie Checkout with canceled=true
   useEffect(() => {
     if (searchParams.get('canceled') === 'true') {
       toast.info('Checkout was canceled. You can try again whenever you’re ready.')
@@ -196,7 +196,7 @@ export default function PricingSection() {
         limit,
       })
 
-      // 3. Redirect to Polar Checkout
+      // 3. Redirect to Mollie Checkout
       if (url) {
         window.location.href = url
       } else {
diff --git a/lib/api/billing.ts b/lib/api/billing.ts
index 49660a6..9f2d29c 100644
--- a/lib/api/billing.ts
+++ b/lib/api/billing.ts
@@ -72,6 +72,8 @@ export interface CreateCheckoutParams {
   plan_id: string
   interval: string
   limit: number
+  country: string
+  vat_id?: string
 }
 
 export async function createCheckoutSession(params: CreateCheckoutParams): Promise<{ url: string }> {
@@ -81,6 +83,13 @@ export async function createCheckoutSession(params: CreateCheckoutParams): Promi
   })
 }
 
+/** Creates a Mollie checkout session to update the payment mandate. */
+export async function updatePaymentMethod(): Promise<{ url: string }> {
+  return apiRequest<{ url: string }>('/api/billing/update-payment-method', {
+    method: 'POST',
+  })
+}
+
 export interface Order {
   id: string
   total_amount: number