Reapply "feat(loyalty): EnakPoint & EnakCoin" (#32)

This reverts commit 4e24f9bbb0.

internal/service/customer_order_payment_service.go

@@ -0,0 +1,34 @@
+package service
+
+import (
+	"context"
+
+	"github.com/google/uuid"
+
+	"apskel-pos-be/internal/contract"
+	"apskel-pos-be/internal/models"
+	"apskel-pos-be/internal/processor"
+	"apskel-pos-be/internal/transformer"
+)
+
+// CustomerOrderPaymentService lets customers pay their own orders with EnakPoint in the
+// app or a self-order (docs/prd-point-coin.md F9).
+type CustomerOrderPaymentService interface {
+	PayWithPoints(ctx context.Context, customerID, orderID uuid.UUID, req *contract.PayWithPointsRequest, info models.CustomerPinRequestInfo) *contract.Response
+}
+
+type CustomerOrderPaymentServiceImpl struct {
+	orders processor.OrderProcessor
+}
+
+func NewCustomerOrderPaymentService(orders processor.OrderProcessor) *CustomerOrderPaymentServiceImpl {
+	return &CustomerOrderPaymentServiceImpl{orders: orders}
+}
+
+func (s *CustomerOrderPaymentServiceImpl) PayWithPoints(ctx context.Context, customerID, orderID uuid.UUID, req *contract.PayWithPointsRequest, info models.CustomerPinRequestInfo) *contract.Response {
+	payment, err := s.orders.PayWithPointsInApp(ctx, customerID, orderID, req.Points, req.Pin, info)
+	if err != nil {
+		return PointPaymentErrorResponse(err)
+	}
+	return contract.BuildSuccessResponse(transformer.PaymentModelToContract(payment))
+}