import OAuth2Strategy from 'passport-oauth2';
import { StrategyOptions as SquareStrategyOptions, VerifyFunction } from './types';
/**
 * `Strategy` constructor.
 *
 * The Square authentication strategy authenticates requests by delegating to
 * Square using the OAuth 2.0 protocol.
 *
 * Applications must supply a `verify` callback which accepts an `accessToken`,
 * `refreshToken` and service-specific `profile`, and then calls the `done`
 * callback supplying a `user`, which should be set to `false` if the
 * credentials are not valid.  If an exception occurred, `err` should be set.
 *
 * Options:
 *   - `clientId`      	your Square application's client id
 *   - `clientSecret`  	your Square application's client secret
 *   - `callbackURL`   	URL to which Square will redirect the user after granting authorization (optional of set in your Square Application
 *   - `grant_type`     Must be authorization_code
 *   - `userProfileURL` URL from with the user profile will be fetched, a `/v1/merchants/me` endpoint on either `connect.squareupsandbox.com` or `connect.squareup.com`
 *
 * Examples:
 *
 *     passport.use(new SquareStrategy({
 *         client_id: '123-456-789',
 *         client_secret: 'shhh-its-a-secret'
 *         redirect_uri: 'https://www.example.net/auth/square/callback'
 *       },
 *       function(accessToken, refreshToken, profile, done) {
 *         User.findOrCreate(..., function (err, user) {
 *           done(err, user);
 *         });
 *       }
 *     ));
 */
export declare class Strategy extends OAuth2Strategy {
    _userProfileURL: string;
    constructor(options: SquareStrategyOptions, verify: VerifyFunction);
    /**
     * Retrieve the merchant profile from Square, see
     * https://developer.squareup.com/reference/square/merchants-api/retrieve-merchant
     * for details
     *
     * This function constructs a normalized profile, with the following properties:
     *
     *   - `provider`       always set to `square`
     *   - `id`             `merchant.id`, The Square-issued ID of the merchant.
     *   - `businessName`   `merchant.business_name`, The business name of the merchant.
     *   - `country`        `merchant.country`, The country code associated with the merchant account, in ISO 3166 format.
     *   - `languageCode`   `merchant.language_code`, The language code associated with the merchant account, in BCP 47 format.
     *   - `currency`       `merchant.currency`, The currency associated with the merchant account, in ISO 4217 format.
     *   - `mainLocationId` `merchant.main_location_id`, The ID of the main Location for this merchant.
     *   - `status`         `merchant.status`, The merchant status, active or inactive.
     *
     *
     * @param {String} accessToken
     * @param {Function} done
     * @api protected
     */
    userProfile(accessToken: string, done: (err: any, user?: any) => void): void;
}