public async Task When_I_refund_a_pending_settlement_Then_it_should_throw_RequestDeclinedException_async()
        {
            _auth = await _cardService.AuthorizeAsync(_auth);

            Settlement settle = Settlement.Builder()
                                .MerchantRefNum(_auth.MerchantRefNum())
                                .AuthorizationId(_auth.Id())
                                .Build();

            settle = await _cardService.SettlementAsync(settle);

            Assert.ThrowsAsync <Paysafe.Common.RequestDeclinedException>(async() => await _cardService.RefundAsync(Refund.Builder()
                                                                                                                   .MerchantRefNum(settle.MerchantRefNum())
                                                                                                                   .SettlementId(settle.Id())
                                                                                                                   .Build()));
        }
        public void When_I_refund_a_pending_settlement_Then_it_should_throw_RequestDeclinedException_sync()
        {
            _auth = _cardService.Authorize(_auth);

            Settlement settle = Settlement.Builder()
                                .MerchantRefNum(_auth.MerchantRefNum())
                                .AuthorizationId(_auth.Id())
                                .Build();

            settle = _cardService.Settlement(settle);

            Assert.Throws <Paysafe.Common.RequestDeclinedException>(() => _cardService.Refund(Refund.Builder()
                                                                                              .MerchantRefNum(settle.MerchantRefNum())
                                                                                              .SettlementId(settle.Id())
                                                                                              .Build()));
        }