export type X402BuyerChallenge = {
    network?: string;
    asset?: string;
    amountRequired?: string;
    payTo?: string;
};
export type X402TypedPaymentErrorName = 'PaymentRequiredError' | 'QuotaExceededError' | 'TokenExpiredError' | 'ValidationFailureError' | 'SpendLimitExceededError' | 'UnknownPaymentError';
export type X402Retryability = 'retry_after_payment' | 'retry_after_quota_reset' | 'refresh_token_then_retry' | 'do_not_retry' | 'operator_review';
export type X402TypedPaymentError = {
    name: X402TypedPaymentErrorName;
    message?: string;
    noCharge: boolean;
    retryAfterSeconds?: number;
};
export type X402QuotaEnvelope = {
    limit?: string | number;
    remaining?: string | number;
    resetAt?: string;
    sourceHeaders?: Record<string, string | undefined>;
};
export type X402SpendEnvelope = {
    maxSpendAtomic: string;
    amountRequiredAtomic?: string;
    remainingAfterPaymentAtomic?: string;
};
export type X402BuyerFlowInput = {
    method: string;
    url: string;
    body?: string;
    signer: string;
    challengeSource: 'directory' | 'payment-required-header' | 'x-payment-required-header' | 'body' | 'manual' | 'none';
    challenge?: X402BuyerChallenge;
    allowedNetworks: string[];
    allowedAssets: string[];
    maxSpendAtomic: string | bigint;
    dryRunCompleted: boolean;
    approvalState: 'approved' | 'pending' | 'declined' | 'not_required';
    idempotencyKey?: string;
    typedError?: X402TypedPaymentError;
    quota?: X402QuotaEnvelope;
    mcpTools: string[];
    audit: {
        destination?: string;
        correlationId?: string;
        receiptSink?: string;
    };
};
export type X402BuyerFlowResult = {
    ok: boolean;
    idempotencyKey: string;
    failures: string[];
    warnings: string[];
    parity: {
        discover: boolean;
        check: boolean;
        dryRun: boolean;
        pay: boolean;
        spendLimit: boolean;
        idempotency: boolean;
        mcpExposure: boolean;
        audit: boolean;
        typedErrors: boolean;
        retryability: boolean;
        quotaEnvelope: boolean;
        noChargeFailures: boolean;
    };
    recovery: {
        errorName?: X402TypedPaymentErrorName;
        retryability: X402Retryability;
        noCharge: boolean;
        quotaVisible: boolean;
    };
    envelope: {
        quota?: X402QuotaEnvelope;
        spend: X402SpendEnvelope;
    };
};
export declare function createX402IdempotencyKey(input: Pick<X402BuyerFlowInput, 'method' | 'url' | 'body' | 'signer'>): string;
export declare function classifyX402PaymentError(error?: X402TypedPaymentError, quota?: X402QuotaEnvelope): X402Retryability;
export declare function verifyX402BuyerFlow(input: X402BuyerFlowInput): X402BuyerFlowResult;
//# sourceMappingURL=x402-buyer-flow.d.ts.map