code: function check(token, secret, options) {
    const delta = checkDelta(token, secret, options);
    return Number.isInteger(delta);
  }
docs: Checks the provided OTP token against system generated token
  
  @module otplib-authenticator/check
  @param {string} token - the OTP token to check
  @param {string} secret - your secret that is used to generate the token
  @param {object} options - options which was used to generate it originally
  @return {boolean}