brenden-t-r

fun verifyCustomPaymentRailSettlement(obligation: Obligation<TokenType>, payment: CustomPayment<TokenType>): VerifyResult {
  val oracleService = serviceHub.cordaService(MyPaymentRailService::class.java)
  val result = oracleService.hasPaymentSettled(payment, obligation)
  // .. check result status, etc..
}

brenden-t-r

@CordaService
class MyPaymentRailService(val services: AppServiceHub) : SingletonSerializeAsToken() {
  // API Methods here
  // checkObligeeReceivedPayment(..)
  // hasPaymentSettled(..)
}

brenden-t-r

class VerifySettlement(private val otherSession: FlowSession) : FlowLogic<Unit>() {

  // .. omitting ..
  
  @Suspendable
    override fun call() {
      // .. omitting ..
      
      // 4. Handle different settlement methods.
        val verifyResult = when (settlementMethod) {

brenden-t-r

abstract class CustomMakeOffLedgerPayment<T: TokenType>(
  val amount: Amount<T>,
  private val obligationStateAndRef: StateAndRef<Obligation<*>>,
  open val settlementMethod: OffLedgerPayment<*>,
  override val progressTracker: ProgressTracker = MakeOffLedgerPayment.tracker()
): MakeOffLedgerPayment<T>(amount, obligationStateAndRef, settlementMethod, progressTracker) {
  @Suspendable
  override fun setup() {
    // Perform any setup tasks needed for your payment rail
  }

brenden-t-r

abstract class CustomMakeOffLedgerPayment<T: TokenType>(
val amount: Amount<T>,
private val obligationStateAndRef: StateAndRef<Obligation<*>>,
open val settlementMethod: OffLedgerPayment<*>,
override val progressTracker: ProgressTracker = MakeOffLedgerPayment.tracker()
): MakeOffLedgerPayment<T>(amount, obligationStateAndRef, settlementMethod) {
  @Suspendable
  override fun setup() {
    // Perform any setup tasks needed for your payment rail
  }

brenden-t-r

data class CustomPayment<T : TokenType>(
        override val paymentReference: PaymentReference,
        override val amount: Amount<T>,
        override var status: PaymentStatus = PaymentStatus.SENT
) : Payment<T> {
    override fun toString(): String {
        return "Amount: $amount, Transaction ID: $paymentReference, Status: $status"
    }
}

brenden-t-r

data class CustomSettlementMethod(
        override val accountToPay: String,
        override val settlementOracle: Party,
        override val paymentFlow: Class<CustomMakeOffLedgerPayment<*>> = CustomMakeOffLedgerPayment::class.java
) : OffLedgerPayment<MakeCustomPayment<*>> {
    override fun toString(): String {
        return "Pay account $accountToPay and use $settlementOracle as settlement Oracle."
    }
}

brenden-t-r

@CordaService
class MyPaymentRailService(val services: AppServiceHub) : SingletonSerializeAsToken() {
  // API methods here
  // makePayment()
  // checkBalance(), etc..
}

brenden-t-r

@CordaService
class MyPaymentRailService(val services: AppServiceHub) : SingletonSerializeAsToken() {
  // API methods here
  // makePayment()
  // checkBalance(), etc..
}

brenden-t-r

@InitiatingFlow
@StartableByRPC
class IOUSettleFlow(val linearId: UniqueIdentifier, val amount: Amount<Currency>): FlowLogic<SignedTransaction>() {
    @Suspendable
    override fun call(): SignedTransaction {
        // Step 1. Retrieve the IOU state from the vault.
        val queryCriteria = QueryCriteria.LinearStateQueryCriteria(linearId = listOf(linearId))
        val iouToSettle = serviceHub.vaultService.queryBy<IOUState>(queryCriteria).states.single()
        val counterparty = iouToSettle.state.data.lender