/**
 * X402 Token Generation API.
 *
 * Provides X402 access token generation functionality for subscribers.
 * Tokens are used to authorize payment verification and settlement.
 */
import { BasePaymentsAPI } from '../api/base-payments.js';
import { PaymentOptions, X402TokenOptions } from '../common/types.js';
/**
 * X402 Token API for generating access tokens.
 *
 * Handles X402 access token generation for subscribers to authorize
 * payment operations with AI agents.
 */
export declare class X402TokenAPI extends BasePaymentsAPI {
    /**
     * Get a singleton instance of the X402TokenAPI class.
     *
     * @param options - The options to initialize the API
     * @returns The instance of the X402TokenAPI class
     */
    static getInstance(options: PaymentOptions): X402TokenAPI;
    /**
     * Get an X402 access token for the given plan, backed by a delegation.
     *
     * This token allows the agent to verify and settle delegations on behalf
     * of the subscriber.
     *
     * The supported flow is **create-first**: create the delegation once with
     * {@link DelegationAPI.createDelegation}, then pass its `delegationId` in
     * `tokenOptions.delegationConfig`. Passing inline create-on-the-fly fields
     * (spending limits / `providerPaymentMethodId` / `cardId`, i.e. no
     * `delegationId`) is **deprecated** and emits a runtime warning.
     *
     * @param planId - The unique identifier of the payment plan
     * @param agentId - The unique identifier of the AI agent (optional)
     * @param tokenOptions - Options controlling scheme and delegation behavior (optional)
     * @returns A promise that resolves to an object containing:
     *   - accessToken: The X402 access token string
     *
     * @throws PaymentsError if the request fails
     *
     * @example
     * ```typescript
     * // Supported: create the delegation first, then request the token by id.
     * const { delegationId } = await payments.delegation.createDelegation({
     *   provider: 'erc4337',
     *   spendingLimitCents: 10000,
     *   durationSecs: 604800,
     *   currency: 'usdc',
     * })
     * const result = await payments.x402.getX402AccessToken(planId, agentId, {
     *   delegationConfig: { delegationId },
     * })
     * ```
     */
    getX402AccessToken(planId: string, agentId?: string, tokenOptions?: X402TokenOptions): Promise<{
        accessToken: string;
        [key: string]: any;
    }>;
}
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