/**
 * Challenge Extension Group (org.peacprotocol/challenge)
 *
 * Records challenge issuance with RFC 9457 Problem Details.
 * Shipped in v0.12.0-preview.1.
 */
import { z } from 'zod';
export declare const CHALLENGE_EXTENSION_KEY: "org.peacprotocol/challenge";
/**
 * Challenge type values (7 total, P0-6).
 * Includes purpose_disallowed (reviewer fix: 7 not 6).
 */
export declare const CHALLENGE_TYPES: readonly ["payment_required", "identity_required", "consent_required", "attestation_required", "rate_limited", "purpose_disallowed", "custom"];
export declare const ChallengeTypeSchema: z.ZodEnum<{
    custom: "custom";
    payment_required: "payment_required";
    identity_required: "identity_required";
    consent_required: "consent_required";
    attestation_required: "attestation_required";
    rate_limited: "rate_limited";
    purpose_disallowed: "purpose_disallowed";
}>;
export type ChallengeType = z.infer<typeof ChallengeTypeSchema>;
/**
 * RFC 9457 Problem Details schema (P0-5).
 *
 * Uses .passthrough() for extension members per RFC 9457 Section 6.2.
 * Required fields: status (HTTP status code), type (problem type URI).
 * Optional fields: title, detail, instance.
 */
export declare const ProblemDetailsSchema: z.ZodObject<{
    status: z.ZodNumber;
    type: z.ZodString;
    title: z.ZodOptional<z.ZodString>;
    detail: z.ZodOptional<z.ZodString>;
    instance: z.ZodOptional<z.ZodString>;
}, z.core.$loose>;
export declare const ChallengeExtensionSchema: z.ZodObject<{
    challenge_type: z.ZodEnum<{
        custom: "custom";
        payment_required: "payment_required";
        identity_required: "identity_required";
        consent_required: "consent_required";
        attestation_required: "attestation_required";
        rate_limited: "rate_limited";
        purpose_disallowed: "purpose_disallowed";
    }>;
    problem: z.ZodObject<{
        status: z.ZodNumber;
        type: z.ZodString;
        title: z.ZodOptional<z.ZodString>;
        detail: z.ZodOptional<z.ZodString>;
        instance: z.ZodOptional<z.ZodString>;
    }, z.core.$loose>;
    resource: z.ZodOptional<z.ZodString>;
    action: z.ZodOptional<z.ZodString>;
    requirements: z.ZodOptional<z.ZodRecord<z.ZodString, z.ZodUnknown>>;
}, z.core.$strict>;
export type ChallengeExtension = z.infer<typeof ChallengeExtensionSchema>;
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