import { StripeExtension } from ".";
/**
 * Get customer's default card id
 *
 * @param customerId - customer id (see: https://stripe.com/docs/api/customers/object#customer_object-id)
 * @param ephemeralKey - customer ephemeral key
 * @returns
 */
export declare const getDefaultCard: (this: StripeExtension, customerId: string, ephemeralKey: string) => Promise<string | undefined>;