/**
 * PaymentsError extends Error to provide detailed error information for payments and authentication.
 * Supports error codes for unauthorized, payment required, and other payment-related errors.
 */
export declare class PaymentsError extends Error {
    code: string;
    /**
     * Creates a new PaymentsError instance.
     * @param message - The error message
     * @param code - The error code (e.g., 'unauthorized', 'payment_required')
     */
    constructor(message: string, code?: string);
    static fromBackend(message: string, error: any): PaymentsError;
    /**
     * Creates an unauthorized error (missing or invalid credentials).
     * @param message - Optional custom message
     */
    static unauthorized(message?: string): PaymentsError;
    /**
     * Creates a payment required error (insufficient credits, etc.).
     * @param message - Optional custom message
     */
    static paymentRequired(message?: string): PaymentsError;
    /**
     * Creates a generic validation error.
     * @param message - Optional custom message
     */
    static validation(message?: string): PaymentsError;
    /**
     * Creates an internal error.
     * @param message - Optional custom message
     */
    static internal(message?: string): PaymentsError;
}
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