import type { AccessToken, RequestPaymentResponse, ErrorResponse, SubmitSuccessResponse, PaymentMethod } from '../types.js';
export declare class ServerError extends Error {
    constructor(message: string | undefined);
}
export declare const catchErrorHandler: (error: unknown, fallbackMessage: string, onError?: (responseStatus: number, error?: ErrorResponse) => void) => unknown;
export declare const getToken: ({ origin, merchantId, publicKey, onError, payload }: {
    origin: string;
    merchantId: string;
    publicKey: string;
    onError?: (responseStatus: number, error?: ErrorResponse) => void;
    payload: {
        gateway_customer_id?: string;
        email?: string;
        strict_mode: boolean;
        payment_type: PaymentMethod;
    };
}) => Promise<AccessToken>;
export declare const requestPayment: ({ accessId, origin, merchantId, publicKey, payload, onError }: {
    accessId: string;
    origin: string;
    merchantId: string;
    publicKey: string;
    payload: SubmitSuccessResponse<"ach" | "card">;
    onError?: (responseStatus: number, error?: ErrorResponse) => void;
}) => Promise<RequestPaymentResponse>;
export declare const successCallback: <T extends "card" | "ach">(response: Response, paymentMethod: T) => Promise<SubmitSuccessResponse<T>>;
export declare const errorCallback: (response?: Response) => Promise<{
    responseStatus: number;
    responseBody: ErrorResponse;
} | {
    responseStatus: number;
    responseBody: undefined;
}>;
export declare const deepMerge: <TBase extends Record<string, unknown>, TPatch extends Record<string, unknown>>(base: TBase, patch: TPatch) => TBase;