import type { PurchaseButtonMethod } from "../../types/components/purchase-button";
type CustomURLConfig = Extract<PurchaseButtonMethod, {
    type: "custom_web_checkout";
}>["custom_url"];
type CustomWebCheckoutContext = {
    packageId: string;
    appUserId?: string;
    isSandbox?: boolean;
    rcSource?: string;
};
/**
 * Mirrors the native SDKs: source, then app user ID, env and package when
 * configured. The source is the host's own, so it survives a same-tab hop.
 * Same-named params are replaced; an unparseable URL is returned unchanged.
 * Script-capable URLs resolve to undefined, so the button purchases instead.
 */
export declare const buildCustomWebCheckoutURL: (url: string, config: CustomURLConfig, { packageId, appUserId, isSandbox, rcSource }: CustomWebCheckoutContext) => string | undefined;
export {};