Migration of HWS extension to Commerce SDK from Retail SDK

[eddiechanmcs]

Hi there

Sorry am new to D365 Commerce development.
I am migrating our current Retail SDK extensions projects to SEALED Commerce SDK version.
(I have watched the Tech Talk series and other online documentation including the Github samples. I have used the samples to begin migrating past code into these new projects.)

I am having trouble with a HWS extension for payment (EFTPOS / Card payment).
There are quite a few types and classes below that do not exist anymore in Commerce SDK.
I do not know how to proceed from here - could someone advise or point me in the right direction?
Searching on Google give zero results for each full keyword.

PSDK.Response response = CardPaymentManager.InvokeAuthorizationCall(this.merchantProperties, this.paymentConnectorName, this.tenderInfo, amount, currency, this.terminalSettings.Locale, true, this.terminalSettings.TerminalId, extensionTransactionProperties);
(there are many calls to CardPaymentManager)

SignatureCaptureHelper.ParsePointArray(string);

private static Dictionary<Guid, TemporaryCardMemoryStorage> cardCache = new Dictionary<Guid, TemporaryCardMemoryStorage>();