v26.1.0: Library allows to provide small negative request amounts like -0.1, while -1.00 is returning failure

[captador]

Describe the bug
Library allows to provide small negative request amounts like -0.1, while -1.00 is returning failure about incorrect value of total amount. Moreover terminal will show 0,10 EUR amount as minus sign dropped at some point.

{"SaleToPOIRequest":{"MessageHeader":{"MessageClass":"Service","MessageCategory":"Payment","MessageType":"Request","ServiceID":"8D4415B5FA","SaleID":"SystemTests","POIID":"P400Plus-806***882","ProtocolVersion":"3.0"},"PaymentRequest":{"SaleData":{"SaleTransactionID":{"TransactionID":"b85fe4ea-c8ab-4b8c-aa63-9d88fe98afb6","TimeStamp":"2025-01-21T12:26:32"},"SaleToPOIData":"eyJPcGVyYXRpb24iOlt7IlR5cGUiOiJQYXltZW50In1dLCJWQVNNb2RlT3ZlcnJpZGUiOiJWQVNNb2RlUGF5bWVudE9ubHkifQ==","SaleToAcquirerData":"eyJhcHBsaWNhdGlvbkluZm8iOnsiYWR5ZW5MaWJyYXJ5Ijp7Im5hbWUiOiJhZHllbi1kb3RuZXQtYXBpLWxpYnJhcnkiLCJ2ZXJzaW9uIjoiMjYuMS4wIn19fQ==","OperatorID":"autotest_dev","SaleReferenceID":"systemTestaac5bf54-7cc5-47be-9be6-764a2e606dc8","TokenRequestedType":"Transaction"},"PaymentTransaction":{"AmountsReq":{"Currency":"EUR","RequestedAmount":-0.1},"TransactionConditions":{"CustomerLanguage":"fi"}},"PaymentData":{"CardAcquisitionReference":{"TransactionID":"bLEO001737462386004","TimeStamp":"2025-01-21T12:26:26"},"PaymentType":"Normal"}}}}

Expected behavior
Same failure is returned as for -1.00 requested amount

{"MessageHeader":{"MessageClass":"Service","MessageCategory":"CardAcquisition","MessageType":"Response","SaleID":"SystemTests","POIID":"P400Plus-806698882","ProtocolVersion":"3.0"},"MessagePayload":{"Response":{"AdditionalResponse":"{\"errors\":\"At SaleToPOIRequest.CardAcquisitionRequest.CardAcquisitionTransaction.TotalAmount: Invalid value\"}","Result":"Failure","ErrorCondition":"MessageFormat"},"SaleData":{"SaleTransactionID":{"TransactionID":"1915b3fa-fd3b-40f2-9963-a4c4448b4eaa","TimeStamp":"2025-01-21T12:31:08Z"},"SaleToAcquirerData":"eyJhcHBsaWNhdGlvbkluZm8iOnsiYWR5ZW5MaWJyYXJ5Ijp7Im5hbWUiOiJhZHllbi1kb3RuZXQtYXBpLWxpYnJhcnkiLCJ2ZXJzaW9uIjoiMjYuMS4wIn19fQ==","SaleReferenceID":"systemTest0f02dde9-9b35-434c-800e-9c4f7d761ff0","TokenRequestedType":"Transaction"},"POIData":{"POITransactionID":{"TransactionID":"bLEO001737462668001","TimeStamp":"2025-01-21T12:31:08.867Z"}}}}

[Kwok-he-Chu]

Thanks for reaching out. I did some digging and I noticed that the two requests are different, hence why the responses are different for each of the requests

1. In the first payload, you're trying to do a regular payment request:
   MessageCategory":"Payment"

Could you provide a screenshot of where the negative amount is shown on the terminal screen + terminal type (e.g. S1F2.. V400m etc.)

2. In the second payload, you're trying to do a card acquisition:
   "MessageCategory":"CardAcquisition"

I don't think you can do a negative amount for card acquisitions, hence the error

[captador]

@Kwok-he-Chu , below is card acq with negative amount -0.1 EUR as well. The point is that -1.0 EUR is leading to error, while -0.1 doesn't and it is inconsistent

{"MessageHeader":{"MessageClass":"Service","MessageCategory":"CardAcquisition","MessageType":"Request","ServiceID":"CAB22B733C","SaleID":"SystemTests","POIID":"P400Plus-806698882","ProtocolVersion":"3.0"},"MessagePayload":{"SaleData":{"SaleTransactionID":{"TransactionID":"06f8a05c-9837-4975-84b9-7809ab542e03","TimeStamp":"2025-02-03T16:35:48.722936Z"},"SaleToPOIData":"eyJPcGVyYXRpb24iOlt7IlR5cGUiOiJFTVZMb3lhbHR5UmVhZCJ9XX0=","SaleToAcquirerData":"eyJhcHBsaWNhdGlvbkluZm8iOnsiYWR5ZW5MaWJyYXJ5Ijp7Im5hbWUiOiJhZHllbi1kb3RuZXQtYXBpLWxpYnJhcnkiLCJ2ZXJzaW9uIjoiMjYuMS4wIn19fQ==","OperatorID":"autotest_dev","SaleReferenceID":"systemTest9c676830-62ae-461b-b866-6b0ac4bc3540","TokenRequestedType":"Customer"},"CardAcquisitionTransaction":{"CustomerLanguage":"fi","TotalAmount":-0.1,"PaymentType":"Normal"}}}

[Kwok-he-Chu]

I'll forward this feedback to the product team, thank you for sharing this!