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Type Alias Builder signature for the overlay rendered on top of the hosted payment-method-management WebView while the hosted page is loading. Consumers can supply a custom builder via CrossmintPaymentMethodManagement.loadingBuilder to swap the default Material spinner for their own design-system loading state. Mirrors the CrossmintCheckoutLoadingBuilder pattern exposed by CrossmintEmbeddedCheckout. 
typedef CrossmintPaymentMethodManagementLoadingBuilder = Widget Function(BuildContext context)