diff --git a/framework/commerce/api/endpoints/checkout.ts b/framework/commerce/api/endpoints/checkout.ts
index 09ebff621..b00bce284 100644
--- a/framework/commerce/api/endpoints/checkout.ts
+++ b/framework/commerce/api/endpoints/checkout.ts
@@ -26,7 +26,7 @@ const checkoutEndpoint: GetAPISchema<
     // Create checkout
     if (req.method === 'GET') {
       const body = { ...req.body, cartId }
-      return await handlers['getCheckout']({ ...ctx, body })
+      return await handlers['getCheckout']?.({ ...ctx, body })
     }
 
     // Create checkout
diff --git a/framework/commerce/types/checkout.ts b/framework/commerce/types/checkout.ts
index 27f553207..ea28926a8 100644
--- a/framework/commerce/types/checkout.ts
+++ b/framework/commerce/types/checkout.ts
@@ -45,7 +45,7 @@ export type SubmitCheckoutHandler<T extends CheckoutTypes = CheckoutTypes> =
   }
 
 export type CheckoutHandlers<T extends CheckoutTypes = CheckoutTypes> = {
-  getCheckout: GetCheckoutHandler<T>
+  getCheckout?: GetCheckoutHandler<T>
   submitCheckout: SubmitCheckoutHandler<T>
 }
 
diff --git a/framework/commerce/types/customer/index.ts b/framework/commerce/types/customer/index.ts
index 7a99d8c5e..70c437c29 100644
--- a/framework/commerce/types/customer/index.ts
+++ b/framework/commerce/types/customer/index.ts
@@ -2,7 +2,7 @@ export * as Card from "./card"
 export * as Address from "./address"
 
 // TODO: define this type
-export type Customer = unknown
+export type Customer = any
 
 export type CustomerTypes = {
   customer: Customer