docs: function registerWalletAddress(url, body, options) {
    options = options || {};
    url = resolveURL(url, '/address');
  
    return new P(function (resolve, reject) {
      request({
        url: url,
        method: options.method || 'POST',
        body: body,
        json: true,
        headers: options.headers
      }, function (err, res, body) {
        if (err) return reject(err);
        return resolve(body);
      });
    });
  }