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"""Extension types for the x402 Python SDK.""" from typing import Any, Protocol class ResourceServerExtension(Protocol): """Interface for resource server extensions (e.g., bazaar). Extensions can enrich payment declarations with additional data based on the transport context (e.g., HTTP request). """ @property def key(self) -> str: """Unique extension key (e.g., 'bazaar').""" ... def enrich_declaration( self, declaration: Any, transport_context: Any, ) -> Any: """Enrich extension declaration with transport-specific data. Args: declaration: The extension declaration to enrich. transport_context: Framework-specific context (e.g., HTTP request). Returns: Enriched declaration. """ ...