refactored payment orchestration

api/payments/orchestrator/storage/model/operation.go

@@ -0,0 +1,15 @@
+package model
+
+type OperationState string
+
+const (
+	OperationStateCreated    OperationState = "created"    // record exists, not started
+	OperationStateProcessing OperationState = "processing" // we are working on it
+	OperationStatePlanned    OperationState = "planned"    // waiting for execution
+	OperationStateWaiting    OperationState = "waiting"    // waiting external world
+
+	OperationStateSuccess   OperationState = "success"   // final success
+	OperationStateFailed    OperationState = "failed"    // final failure
+	OperationStateCancelled OperationState = "cancelled" // final cancelled
+	OperationStateSkipped   OperationState = "skipped"   // final skipped
+)