def payu_verify_params(params)
      pos_id = params['pos_id']
      pos = Payu[pos_id]

      Signature.verify!(
        params['sig'],
        params['pos_id'],
        params['session_id'],
        params['ts'],
        pos.key2
      )
    end
def payu_verify_params(params)
      pos_id = params['pos_id']
      pos = Payu[pos_id]

      Signature.verify!(
        params['sig'],
        params['pos_id'],
        params['session_id'],
        params['ts'],
        pos.key2
      )
    end
Verifies signature of passed parameters from Payu request