/**
 * Add podcast subscription payload definition.
 */
type Add = {
    /**
     * The podcast's RSS feed URL.
     *
     * @example 'https://example.com/podcast/rss'
     */
    url: string;
    /**
     * A URL that the app should open after successfully subscribing.
     *
     * @example 'myapp://success'
     */
    xSuccess?: string;
};
/**
 * Subscribe to a podcast RSS feed in Overcast using x-callback-url standard.
 *
 * @param payload Add podcast subscription payload.
 * @returns Overcast subscribe URL.
 * @example
 * add({
 *   url: 'https://example.com/podcast/rss',
 * })
 * // => 'overcast://x-callback-url/add?url=https%3A%2F%2Fexample.com%2Fpodcast%2Frss'
 * @example
 * add({
 *   url: 'https://example.com/podcast/rss',
 *   xSuccess: 'myapp://success',
 * })
 * // => 'overcast://x-callback-url/add?url=https%3A%2F%2Fexample.com%2Fpodcast%2Frss&x-success=myapp%3A%2F%2Fsuccess'
 * @link https://overcast.fm/podcasterinfo
 */
export declare function add(payload: Add): string;
export {};