/**
 * Combine inputs per protocol 3241645161d8 to generate an 'invoice' string used for cryptographic key generation.
 * @param prefix Typically a random string unique to a single transaction.
 * @param suffix Typically a random string unique to a single output in that transaction.
 * @param paymail An optional paymail handle
 * @returns
 */
export declare function invoice3241645161d8(prefix: string, suffix: string, paymail?: string): string;
export declare const invoice3241645161d8Protocol = "2-3241645161d8";
//# sourceMappingURL=invoice.d.ts.map