update orderflow

pkg/order/passthrough.go

@@ -0,0 +1,60 @@
+package order
+
+import (
+	"context"
+	"fmt"
+)
+
+// PassthroughProvider records an already-settled authorization and capture without
+// calling an external provider. It is the bridge between the checkout grain's
+// externally-processed payments (Klarna, Adyen) and the order grain's event log:
+// the payment was already settled by the provider, so the order grain just needs
+// to record the facts.
+//
+// Create one per order with the exact provider name, reference and amount the
+// external processor returned. Refund returns an error — use the external
+// processor's own refund API for that. Void is a no-op.
+type PassthroughProvider struct {
+	name      string
+	reference string
+	amount    int64
+}
+
+// NewPassthroughProvider returns a provider that records provider/ref/amount
+// for both authorize and capture. amount is in minor currency units (öre).
+func NewPassthroughProvider(providerName, reference string, amount int64) *PassthroughProvider {
+	return &PassthroughProvider{
+		name:      providerName,
+		reference: reference,
+		amount:    amount,
+	}
+}
+
+var _ PaymentProvider = (*PassthroughProvider)(nil)
+
+func (p *PassthroughProvider) Name() string { return p.name }
+
+func (p *PassthroughProvider) Authorize(_ context.Context, _ string, _ int64, _ string) (Authorization, error) {
+	return Authorization{
+		Provider:  p.name,
+		Reference: p.reference,
+		Amount:    p.amount,
+	}, nil
+}
+
+func (p *PassthroughProvider) Capture(_ context.Context, _ string, _ int64) (Capture, error) {
+	if p.reference == "" {
+		return Capture{}, fmt.Errorf("passthrough: capture requires a processor reference")
+	}
+	return Capture{
+		Provider:  p.name,
+		Reference: p.reference,
+		Amount:    p.amount,
+	}, nil
+}
+
+func (p *PassthroughProvider) Refund(_ context.Context, _ string, _ int64) (RefundResult, error) {
+	return RefundResult{}, fmt.Errorf("passthrough: refund not implemented — use the external provider directly")
+}
+
+func (p *PassthroughProvider) Void(_ context.Context, _ string) error { return nil }