/**
 * Utility to extract the Autorization token by the
 * header, while performing minimum validation.
 *
 * @throws if scheme is invalid
 * @throws if the token is empty
 * @param authorizationString
 * @returns
 */
export declare function getAuthorizationToken(authorizationString: string): string;
/**
 * Utility to verify the scheme sent by Apple.
 * It should always be "ApplePass", but... you never know!
 *
 * @param authorizationString
 * @returns
 */
export declare function isAuthorizationSchemeValid(authorizationString: string): boolean;
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