新增订单待支付与支付确认后端流程

backend/internal/modules/wallet/service.go

@@ -2,7 +2,11 @@ package wallet
 
 import "errors"
 
-var ErrDependencyUnavailable = errors.New("dependency unavailable")
+var (
+	ErrDependencyUnavailable = errors.New("dependency unavailable")
+	ErrInvalidAmount         = errors.New("invalid amount")
+	ErrInsufficientBalance   = errors.New("insufficient balance")
+)
 
 type Service struct {
 	repo *Repository
@@ -26,6 +30,16 @@ func (s *Service) Ledger(userID uint64) ([]LedgerDTO, error) {
 	return s.repo.Ledger(userID)
 }
 
+func (s *Service) Recharge(userID uint64, req RechargeRequest) (*AccountDTO, error) {
+	if s.repo == nil {
+		return nil, ErrDependencyUnavailable
+	}
+	if req.Amount <= 0 {
+		return nil, ErrInvalidAmount
+	}
+	return s.repo.Recharge(userID, req.Amount)
+}
+
 func (s *Service) AdminLedger(query AdminLedgerQuery) ([]AdminLedgerDTO, error) {
 	if s.repo == nil {
 		return nil, ErrDependencyUnavailable