{"version":3,"sources":["../../../src/server/x402ResourceServer.ts"],"sourcesContent":["import {\n SettleError,\n SettleResponse,\n VerifyResponse,\n SupportedResponse,\n SupportedKind,\n} from \"../types/facilitator\";\nimport { PaymentPayload, PaymentRequirements, PaymentRequired } from \"../types/payments\";\nimport { SchemeNetworkServer } from \"../types/mechanisms\";\nimport { Price, Network, ResourceServerExtension, VerifyError } from \"../types\";\nimport { deepEqual, findByNetworkAndScheme } from \"../utils\";\nimport { FacilitatorClient, HTTPFacilitatorClient } from \"../http/httpFacilitatorClient\";\nimport { x402Version } from \"..\";\n\n/**\n * Configuration for a protected resource\n * Only contains payment-specific configuration, not resource metadata\n */\nexport interface ResourceConfig {\n scheme: string;\n payTo: string; // Payment recipient address\n price: Price;\n network: Network;\n maxTimeoutSeconds?: number;\n}\n\n/**\n * Resource information for PaymentRequired response\n */\nexport interface ResourceInfo {\n url: string;\n description: string;\n mimeType: string;\n}\n\n/**\n * Lifecycle Hook Context Interfaces\n */\n\nexport interface PaymentRequiredContext {\n requirements: PaymentRequirements[];\n resourceInfo: ResourceInfo;\n error?: string;\n paymentRequiredResponse: PaymentRequired;\n}\n\nexport interface VerifyContext {\n paymentPayload: PaymentPayload;\n requirements: PaymentRequirements;\n}\n\nexport interface VerifyResultContext extends VerifyContext {\n result: VerifyResponse;\n}\n\nexport interface VerifyFailureContext extends VerifyContext {\n error: Error;\n}\n\nexport interface SettleContext {\n paymentPayload: PaymentPayload;\n requirements: PaymentRequirements;\n}\n\nexport interface SettleResultContext extends SettleContext {\n result: SettleResponse;\n}\n\nexport interface SettleFailureContext extends SettleContext {\n error: Error;\n}\n\n/**\n * Lifecycle Hook Type Definitions\n */\n\nexport type BeforeVerifyHook = (\n context: VerifyContext,\n) => Promise;\n\nexport type AfterVerifyHook = (context: VerifyResultContext) => Promise;\n\nexport type OnVerifyFailureHook = (\n context: VerifyFailureContext,\n) => Promise;\n\nexport type BeforeSettleHook = (\n context: SettleContext,\n) => Promise;\n\nexport type AfterSettleHook = (context: SettleResultContext) => Promise;\n\nexport type OnSettleFailureHook = (\n context: SettleFailureContext,\n) => Promise;\n\n/**\n * Core x402 protocol server for resource protection\n * Transport-agnostic implementation of the x402 payment protocol\n */\nexport class x402ResourceServer {\n private facilitatorClients: FacilitatorClient[];\n private registeredServerSchemes: Map> = new Map();\n private supportedResponsesMap: Map>> =\n new Map();\n private facilitatorClientsMap: Map>> =\n new Map();\n private registeredExtensions: Map = new Map();\n\n private beforeVerifyHooks: BeforeVerifyHook[] = [];\n private afterVerifyHooks: AfterVerifyHook[] = [];\n private onVerifyFailureHooks: OnVerifyFailureHook[] = [];\n private beforeSettleHooks: BeforeSettleHook[] = [];\n private afterSettleHooks: AfterSettleHook[] = [];\n private onSettleFailureHooks: OnSettleFailureHook[] = [];\n\n /**\n * Creates a new x402ResourceServer instance.\n *\n * @param facilitatorClients - Optional facilitator client(s) for payment processing\n */\n constructor(facilitatorClients?: FacilitatorClient | FacilitatorClient[]) {\n // Normalize facilitator clients to array\n if (!facilitatorClients) {\n // No clients provided, create a default HTTP client\n this.facilitatorClients = [new HTTPFacilitatorClient()];\n } else if (Array.isArray(facilitatorClients)) {\n // Array of clients provided\n this.facilitatorClients =\n facilitatorClients.length > 0 ? facilitatorClients : [new HTTPFacilitatorClient()];\n } else {\n // Single client provided\n this.facilitatorClients = [facilitatorClients];\n }\n }\n\n /**\n * Register a scheme/network server implementation.\n *\n * @param network - The network identifier\n * @param server - The scheme/network server implementation\n * @returns The x402ResourceServer instance for chaining\n */\n register(network: Network, server: SchemeNetworkServer): x402ResourceServer {\n if (!this.registeredServerSchemes.has(network)) {\n this.registeredServerSchemes.set(network, new Map());\n }\n\n const serverByScheme = this.registeredServerSchemes.get(network)!;\n if (!serverByScheme.has(server.scheme)) {\n serverByScheme.set(server.scheme, server);\n }\n\n return this;\n }\n\n /**\n * Check if a scheme is registered for a given network.\n *\n * @param network - The network identifier\n * @param scheme - The payment scheme name\n * @returns True if the scheme is registered for the network, false otherwise\n */\n hasRegisteredScheme(network: Network, scheme: string): boolean {\n return !!findByNetworkAndScheme(this.registeredServerSchemes, scheme, network);\n }\n\n /**\n * Registers a resource service extension that can enrich extension declarations.\n *\n * @param extension - The extension to register\n * @returns The x402ResourceServer instance for chaining\n */\n registerExtension(extension: ResourceServerExtension): this {\n this.registeredExtensions.set(extension.key, extension);\n return this;\n }\n\n /**\n * Check if an extension is registered.\n *\n * @param key - The extension key\n * @returns True if the extension is registered\n */\n hasExtension(key: string): boolean {\n return this.registeredExtensions.has(key);\n }\n\n /**\n * Get all registered extensions.\n *\n * @returns Array of registered extensions\n */\n getExtensions(): ResourceServerExtension[] {\n return Array.from(this.registeredExtensions.values());\n }\n\n /**\n * Enriches declared extensions using registered extension hooks.\n *\n * @param declaredExtensions - Extensions declared on the route\n * @param transportContext - Transport-specific context (HTTP, A2A, MCP, etc.)\n * @returns Enriched extensions map\n */\n enrichExtensions(\n declaredExtensions: Record,\n transportContext: unknown,\n ): Record {\n const enriched: Record = {};\n\n for (const [key, declaration] of Object.entries(declaredExtensions)) {\n const extension = this.registeredExtensions.get(key);\n\n if (extension?.enrichDeclaration) {\n enriched[key] = extension.enrichDeclaration(declaration, transportContext);\n } else {\n enriched[key] = declaration;\n }\n }\n\n return enriched;\n }\n\n /**\n * Register a hook to execute before payment verification.\n * Can abort verification by returning { abort: true, reason: string }\n *\n * @param hook - The hook function to register\n * @returns The x402ResourceServer instance for chaining\n */\n onBeforeVerify(hook: BeforeVerifyHook): x402ResourceServer {\n this.beforeVerifyHooks.push(hook);\n return this;\n }\n\n /**\n * Register a hook to execute after successful payment verification.\n *\n * @param hook - The hook function to register\n * @returns The x402ResourceServer instance for chaining\n */\n onAfterVerify(hook: AfterVerifyHook): x402ResourceServer {\n this.afterVerifyHooks.push(hook);\n return this;\n }\n\n /**\n * Register a hook to execute when payment verification fails.\n * Can recover from failure by returning { recovered: true, result: VerifyResponse }\n *\n * @param hook - The hook function to register\n * @returns The x402ResourceServer instance for chaining\n */\n onVerifyFailure(hook: OnVerifyFailureHook): x402ResourceServer {\n this.onVerifyFailureHooks.push(hook);\n return this;\n }\n\n /**\n * Register a hook to execute before payment settlement.\n * Can abort settlement by returning { abort: true, reason: string }\n *\n * @param hook - The hook function to register\n * @returns The x402ResourceServer instance for chaining\n */\n onBeforeSettle(hook: BeforeSettleHook): x402ResourceServer {\n this.beforeSettleHooks.push(hook);\n return this;\n }\n\n /**\n * Register a hook to execute after successful payment settlement.\n *\n * @param hook - The hook function to register\n * @returns The x402ResourceServer instance for chaining\n */\n onAfterSettle(hook: AfterSettleHook): x402ResourceServer {\n this.afterSettleHooks.push(hook);\n return this;\n }\n\n /**\n * Register a hook to execute when payment settlement fails.\n * Can recover from failure by returning { recovered: true, result: SettleResponse }\n *\n * @param hook - The hook function to register\n * @returns The x402ResourceServer instance for chaining\n */\n onSettleFailure(hook: OnSettleFailureHook): x402ResourceServer {\n this.onSettleFailureHooks.push(hook);\n return this;\n }\n\n /**\n * Initialize by fetching supported kinds from all facilitators\n * Creates mappings for supported responses and facilitator clients\n * Earlier facilitators in the array get precedence\n */\n async initialize(): Promise {\n // Clear existing mappings\n this.supportedResponsesMap.clear();\n this.facilitatorClientsMap.clear();\n\n // Fetch supported kinds from all facilitator clients\n // Process in order to give precedence to earlier facilitators\n for (const facilitatorClient of this.facilitatorClients) {\n try {\n const supported = await facilitatorClient.getSupported();\n\n // Process each supported kind (now flat array with version in each element)\n for (const kind of supported.kinds) {\n const x402Version = kind.x402Version;\n\n // Get or create version map for supported responses\n if (!this.supportedResponsesMap.has(x402Version)) {\n this.supportedResponsesMap.set(x402Version, new Map());\n }\n const responseVersionMap = this.supportedResponsesMap.get(x402Version)!;\n\n // Get or create version map for facilitator clients\n if (!this.facilitatorClientsMap.has(x402Version)) {\n this.facilitatorClientsMap.set(x402Version, new Map());\n }\n const clientVersionMap = this.facilitatorClientsMap.get(x402Version)!;\n\n // Get or create network map for responses\n if (!responseVersionMap.has(kind.network)) {\n responseVersionMap.set(kind.network, new Map());\n }\n const responseNetworkMap = responseVersionMap.get(kind.network)!;\n\n // Get or create network map for clients\n if (!clientVersionMap.has(kind.network)) {\n clientVersionMap.set(kind.network, new Map());\n }\n const clientNetworkMap = clientVersionMap.get(kind.network)!;\n\n // Only store if not already present (gives precedence to earlier facilitators)\n if (!responseNetworkMap.has(kind.scheme)) {\n responseNetworkMap.set(kind.scheme, supported);\n clientNetworkMap.set(kind.scheme, facilitatorClient);\n }\n }\n } catch (error) {\n // Log error but continue with other facilitators\n console.warn(`Failed to fetch supported kinds from facilitator: ${error}`);\n }\n }\n }\n\n /**\n * Get supported kind for a specific version, network, and scheme\n *\n * @param x402Version - The x402 version\n * @param network - The network identifier\n * @param scheme - The payment scheme\n * @returns The supported kind or undefined if not found\n */\n getSupportedKind(\n x402Version: number,\n network: Network,\n scheme: string,\n ): SupportedKind | undefined {\n const versionMap = this.supportedResponsesMap.get(x402Version);\n if (!versionMap) return undefined;\n\n const supportedResponse = findByNetworkAndScheme(versionMap, scheme, network);\n if (!supportedResponse) return undefined;\n\n // Find the specific kind from the response (kinds are flat array with version in each element)\n return supportedResponse.kinds.find(\n kind =>\n kind.x402Version === x402Version && kind.network === network && kind.scheme === scheme,\n );\n }\n\n /**\n * Get facilitator extensions for a specific version, network, and scheme\n *\n * @param x402Version - The x402 version\n * @param network - The network identifier\n * @param scheme - The payment scheme\n * @returns The facilitator extensions or empty array if not found\n */\n getFacilitatorExtensions(x402Version: number, network: Network, scheme: string): string[] {\n const versionMap = this.supportedResponsesMap.get(x402Version);\n if (!versionMap) return [];\n\n const supportedResponse = findByNetworkAndScheme(versionMap, scheme, network);\n return supportedResponse?.extensions || [];\n }\n\n /**\n * Build payment requirements for a protected resource\n *\n * @param resourceConfig - Configuration for the protected resource\n * @returns Array of payment requirements\n */\n async buildPaymentRequirements(resourceConfig: ResourceConfig): Promise {\n const requirements: PaymentRequirements[] = [];\n\n // Find the matching server implementation\n const scheme = resourceConfig.scheme;\n const SchemeNetworkServer = findByNetworkAndScheme(\n this.registeredServerSchemes,\n scheme,\n resourceConfig.network,\n );\n\n if (!SchemeNetworkServer) {\n // Fallback to placeholder implementation if no server registered\n // TODO: Remove this fallback once implementations are registered\n console.warn(\n `No server implementation registered for scheme: ${scheme}, network: ${resourceConfig.network}`,\n );\n return requirements;\n }\n\n // Find the matching supported kind from facilitator\n const supportedKind = this.getSupportedKind(\n x402Version,\n resourceConfig.network,\n SchemeNetworkServer.scheme,\n );\n\n if (!supportedKind) {\n throw new Error(\n `Facilitator does not support ${SchemeNetworkServer.scheme} on ${resourceConfig.network}. ` +\n `Make sure to call initialize() to fetch supported kinds from facilitators.`,\n );\n }\n\n // Get facilitator extensions for this combination\n const facilitatorExtensions = this.getFacilitatorExtensions(\n x402Version,\n resourceConfig.network,\n SchemeNetworkServer.scheme,\n );\n\n // Parse the price using the scheme's price parser\n const parsedPrice = await SchemeNetworkServer.parsePrice(\n resourceConfig.price,\n resourceConfig.network,\n );\n\n // Build base payment requirements from resource config\n const baseRequirements: PaymentRequirements = {\n scheme: SchemeNetworkServer.scheme,\n network: resourceConfig.network,\n amount: parsedPrice.amount,\n asset: parsedPrice.asset,\n payTo: resourceConfig.payTo,\n maxTimeoutSeconds: resourceConfig.maxTimeoutSeconds || 300, // Default 5 minutes\n extra: {\n ...parsedPrice.extra,\n },\n };\n\n // Delegate to the implementation for scheme-specific enhancements\n // Note: enhancePaymentRequirements expects x402Version in the kind, so we add it back\n const requirement = await SchemeNetworkServer.enhancePaymentRequirements(\n baseRequirements,\n {\n ...supportedKind,\n x402Version,\n },\n facilitatorExtensions,\n );\n\n requirements.push(requirement);\n return requirements;\n }\n\n /**\n * Build payment requirements from multiple payment options\n * This method handles resolving dynamic payTo/price functions and builds requirements for each option\n *\n * @param paymentOptions - Array of payment options to convert\n * @param context - HTTP request context for resolving dynamic functions\n * @returns Array of payment requirements (one per option)\n */\n async buildPaymentRequirementsFromOptions(\n paymentOptions: Array<{\n scheme: string;\n payTo: string | ((context: TContext) => string | Promise);\n price: Price | ((context: TContext) => Price | Promise);\n network: Network;\n maxTimeoutSeconds?: number;\n }>,\n context: TContext,\n ): Promise {\n const allRequirements: PaymentRequirements[] = [];\n\n for (const option of paymentOptions) {\n // Resolve dynamic payTo and price if they are functions\n const resolvedPayTo =\n typeof option.payTo === \"function\" ? await option.payTo(context) : option.payTo;\n const resolvedPrice =\n typeof option.price === \"function\" ? await option.price(context) : option.price;\n\n const resourceConfig: ResourceConfig = {\n scheme: option.scheme,\n payTo: resolvedPayTo,\n price: resolvedPrice,\n network: option.network,\n maxTimeoutSeconds: option.maxTimeoutSeconds,\n };\n\n // Use existing buildPaymentRequirements for each option\n const requirements = await this.buildPaymentRequirements(resourceConfig);\n allRequirements.push(...requirements);\n }\n\n return allRequirements;\n }\n\n /**\n * Create a payment required response\n *\n * @param requirements - Payment requirements\n * @param resourceInfo - Resource information\n * @param error - Error message\n * @param extensions - Optional declared extensions (for per-key enrichment)\n * @returns Payment required response object\n */\n async createPaymentRequiredResponse(\n requirements: PaymentRequirements[],\n resourceInfo: ResourceInfo,\n error?: string,\n extensions?: Record,\n ): Promise {\n // V2 response with resource at top level\n let response: PaymentRequired = {\n x402Version: 2,\n error,\n resource: resourceInfo,\n accepts: requirements as PaymentRequirements[],\n };\n\n // Add extensions if provided\n if (extensions && Object.keys(extensions).length > 0) {\n response.extensions = extensions;\n }\n\n // Let declared extensions add data to PaymentRequired response\n if (extensions) {\n for (const [key, declaration] of Object.entries(extensions)) {\n const extension = this.registeredExtensions.get(key);\n if (extension?.enrichPaymentRequiredResponse) {\n try {\n const context: PaymentRequiredContext = {\n requirements,\n resourceInfo,\n error,\n paymentRequiredResponse: response,\n };\n const extensionData = await extension.enrichPaymentRequiredResponse(\n declaration,\n context,\n );\n if (extensionData !== undefined) {\n if (!response.extensions) {\n response.extensions = {};\n }\n response.extensions[key] = extensionData;\n }\n } catch (error) {\n console.error(\n `Error in enrichPaymentRequiredResponse hook for extension ${key}:`,\n error,\n );\n }\n }\n }\n }\n\n return response;\n }\n\n /**\n * Verify a payment against requirements\n *\n * @param paymentPayload - The payment payload to verify\n * @param requirements - The payment requirements\n * @returns Verification response\n */\n async verifyPayment(\n paymentPayload: PaymentPayload,\n requirements: PaymentRequirements,\n ): Promise {\n const context: VerifyContext = {\n paymentPayload,\n requirements,\n };\n\n // Execute beforeVerify hooks\n for (const hook of this.beforeVerifyHooks) {\n try {\n const result = await hook(context);\n if (result && \"abort\" in result && result.abort) {\n return {\n isValid: false,\n invalidReason: result.reason,\n invalidMessage: result.message,\n };\n }\n } catch (error) {\n throw new VerifyError(400, {\n isValid: false,\n invalidReason: \"before_verify_hook_error\",\n invalidMessage: error instanceof Error ? error.message : \"\",\n });\n }\n }\n\n try {\n // Find the facilitator that supports this payment type\n const facilitatorClient = this.getFacilitatorClient(\n paymentPayload.x402Version,\n requirements.network,\n requirements.scheme,\n );\n\n let verifyResult: VerifyResponse;\n\n if (!facilitatorClient) {\n // Fallback: try all facilitators if no specific support found\n let lastError: Error | undefined;\n\n for (const client of this.facilitatorClients) {\n try {\n verifyResult = await client.verify(paymentPayload, requirements);\n break;\n } catch (error) {\n lastError = error as Error;\n }\n }\n\n if (!verifyResult!) {\n throw (\n lastError ||\n new Error(\n `No facilitator supports ${requirements.scheme} on ${requirements.network} for v${paymentPayload.x402Version}`,\n )\n );\n }\n } else {\n // Use the specific facilitator that supports this payment\n verifyResult = await facilitatorClient.verify(paymentPayload, requirements);\n }\n\n // Execute afterVerify hooks\n const resultContext: VerifyResultContext = {\n ...context,\n result: verifyResult,\n };\n\n for (const hook of this.afterVerifyHooks) {\n await hook(resultContext);\n }\n\n return verifyResult;\n } catch (error) {\n const failureContext: VerifyFailureContext = {\n ...context,\n error: error as Error,\n };\n\n // Execute onVerifyFailure hooks\n for (const hook of this.onVerifyFailureHooks) {\n const result = await hook(failureContext);\n if (result && \"recovered\" in result && result.recovered) {\n return result.result;\n }\n }\n\n throw error;\n }\n }\n\n /**\n * Settle a verified payment\n *\n * @param paymentPayload - The payment payload to settle\n * @param requirements - The payment requirements\n * @param declaredExtensions - Optional declared extensions (for per-key enrichment)\n * @returns Settlement response\n */\n async settlePayment(\n paymentPayload: PaymentPayload,\n requirements: PaymentRequirements,\n declaredExtensions?: Record,\n ): Promise {\n const context: SettleContext = {\n paymentPayload,\n requirements,\n };\n\n // Execute beforeSettle hooks\n for (const hook of this.beforeSettleHooks) {\n try {\n const result = await hook(context);\n if (result && \"abort\" in result && result.abort) {\n throw new SettleError(400, {\n success: false,\n errorReason: result.reason,\n errorMessage: result.message,\n transaction: \"\",\n network: requirements.network,\n });\n }\n } catch (error) {\n throw new SettleError(400, {\n success: false,\n errorReason: \"before_settle_hook_error\",\n errorMessage: error instanceof Error ? error.message : \"\",\n transaction: \"\",\n network: requirements.network,\n });\n }\n }\n\n try {\n // Find the facilitator that supports this payment type\n const facilitatorClient = this.getFacilitatorClient(\n paymentPayload.x402Version,\n requirements.network,\n requirements.scheme,\n );\n\n let settleResult: SettleResponse;\n\n if (!facilitatorClient) {\n // Fallback: try all facilitators if no specific support found\n let lastError: Error | undefined;\n\n for (const client of this.facilitatorClients) {\n try {\n settleResult = await client.settle(paymentPayload, requirements);\n break;\n } catch (error) {\n lastError = error as Error;\n }\n }\n\n if (!settleResult!) {\n throw (\n lastError ||\n new Error(\n `No facilitator supports ${requirements.scheme} on ${requirements.network} for v${paymentPayload.x402Version}`,\n )\n );\n }\n } else {\n // Use the specific facilitator that supports this payment\n settleResult = await facilitatorClient.settle(paymentPayload, requirements);\n }\n\n // Execute afterSettle hooks\n const resultContext: SettleResultContext = {\n ...context,\n result: settleResult,\n };\n\n for (const hook of this.afterSettleHooks) {\n await hook(resultContext);\n }\n\n // Let declared extensions add data to settlement response\n if (declaredExtensions) {\n for (const [key, declaration] of Object.entries(declaredExtensions)) {\n const extension = this.registeredExtensions.get(key);\n if (extension?.enrichSettlementResponse) {\n try {\n const extensionData = await extension.enrichSettlementResponse(\n declaration,\n resultContext,\n );\n if (extensionData !== undefined) {\n if (!settleResult.extensions) {\n settleResult.extensions = {};\n }\n settleResult.extensions[key] = extensionData;\n }\n } catch (error) {\n console.error(`Error in enrichSettlementResponse hook for extension ${key}:`, error);\n }\n }\n }\n }\n\n return settleResult;\n } catch (error) {\n const failureContext: SettleFailureContext = {\n ...context,\n error: error as Error,\n };\n\n // Execute onSettleFailure hooks\n for (const hook of this.onSettleFailureHooks) {\n const result = await hook(failureContext);\n if (result && \"recovered\" in result && result.recovered) {\n return result.result;\n }\n }\n\n throw error;\n }\n }\n\n /**\n * Find matching payment requirements for a payment\n *\n * @param availableRequirements - Array of available payment requirements\n * @param paymentPayload - The payment payload\n * @returns Matching payment requirements or undefined\n */\n findMatchingRequirements(\n availableRequirements: PaymentRequirements[],\n paymentPayload: PaymentPayload,\n ): PaymentRequirements | undefined {\n switch (paymentPayload.x402Version) {\n case 2:\n // For v2, match by accepted requirements\n return availableRequirements.find(paymentRequirements =>\n deepEqual(paymentRequirements, paymentPayload.accepted),\n );\n case 1:\n // For v1, match by scheme and network\n return availableRequirements.find(\n req =>\n req.scheme === paymentPayload.accepted.scheme &&\n req.network === paymentPayload.accepted.network,\n );\n default:\n throw new Error(\n `Unsupported x402 version: ${(paymentPayload as PaymentPayload).x402Version}`,\n );\n }\n }\n\n /**\n * Process a payment request\n *\n * @param paymentPayload - Optional payment payload if provided\n * @param resourceConfig - Configuration for the protected resource\n * @param resourceInfo - Information about the resource being accessed\n * @param extensions - Optional extensions to include in the response\n * @returns Processing result\n */\n async processPaymentRequest(\n paymentPayload: PaymentPayload | null,\n resourceConfig: ResourceConfig,\n resourceInfo: ResourceInfo,\n extensions?: Record,\n ): Promise<{\n success: boolean;\n requiresPayment?: PaymentRequired;\n verificationResult?: VerifyResponse;\n settlementResult?: SettleResponse;\n error?: string;\n }> {\n const requirements = await this.buildPaymentRequirements(resourceConfig);\n\n if (!paymentPayload) {\n return {\n success: false,\n requiresPayment: await this.createPaymentRequiredResponse(\n requirements,\n resourceInfo,\n \"Payment required\",\n extensions,\n ),\n };\n }\n\n // Find matching requirements\n const matchingRequirements = this.findMatchingRequirements(requirements, paymentPayload);\n if (!matchingRequirements) {\n return {\n success: false,\n requiresPayment: await this.createPaymentRequiredResponse(\n requirements,\n resourceInfo,\n \"No matching payment requirements found\",\n extensions,\n ),\n };\n }\n\n // Verify payment\n const verificationResult = await this.verifyPayment(paymentPayload, matchingRequirements);\n if (!verificationResult.isValid) {\n return {\n success: false,\n error: verificationResult.invalidReason,\n verificationResult,\n };\n }\n\n // Payment verified, ready for settlement\n return {\n success: true,\n verificationResult,\n };\n }\n\n /**\n * Get facilitator client for a specific version, network, and scheme\n *\n * @param x402Version - The x402 version\n * @param network - The network identifier\n * @param scheme - The payment scheme\n * @returns The facilitator client or undefined if not found\n */\n private getFacilitatorClient(\n x402Version: number,\n network: Network,\n scheme: string,\n ): FacilitatorClient | undefined {\n const versionMap = this.facilitatorClientsMap.get(x402Version);\n if (!versionMap) return undefined;\n\n // Use findByNetworkAndScheme for pattern matching\n return findByNetworkAndScheme(versionMap, scheme, network);\n }\n}\n\nexport default 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