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Type Alias Builds a widget that owns the OTP signer prompt UI for the wallet provider. 
typedef CrossmintOtpPromptBuilder = Widget Function( BuildContext context, CrossmintWalletOtpController otpController, Widget child, )
The provider invokes this builder when its wallet controller has a pending OTP challenge so that consumers can render the prompt with their own design system. Pass crossmintDefaultOtpPromptBuilder (from crossmint_flutter_ui.dart) for the Material default that mirrors the React Native SDK; supply a custom builder for headless integrations.