Revert "add layers, add missing model."

This reverts commit 7d152b2cd1.

model/hosted_customer.go

@@ -59,13 +59,3 @@ type SelfHostedBillingAccessRequest struct {
 type SelfHostedBillingAccessResponse struct {
 	Token string `json:"token"`
 }
-
-type SelfHostedExpansionRequest struct {
-	Seats     int    `json:"seats"`
-	LicenseId string `json:"license_id"`
-}
-
-type SelfHostedExpansionConfirmPaymentMethodRequest struct {
-	StripeSetupIntentID string                     `json:"stripe_setup_intent_id"`
-	ExpandRequest       SelfHostedExpansionRequest `json:"expand_request"`
-}