import { BuildPayload } from "../RequestDTOs/PaymentRequest";
export declare function transformUndefinedToNull(obj: any): any;
export declare function createHeader(countryCode: string, signature: string, authorization: string, contentType: string): any;
export declare function removeUndefinedValues(obj: {
    [key: string]: any;
}): {
    [key: string]: any;
};
export declare function createSign(builder: BuildPayload, privateKey: string): string;