Update payment

internal/repository/tx_manager.go

@@ -0,0 +1,35 @@
+package repository
+
+import (
+	"context"
+
+	"gorm.io/gorm"
+)
+
+type txKeyType struct{}
+
+var txKey = txKeyType{}
+
+// DBFromContext returns the transactional *gorm.DB from context if present; otherwise returns base.
+func DBFromContext(ctx context.Context, base *gorm.DB) *gorm.DB {
+	if v := ctx.Value(txKey); v != nil {
+		if tx, ok := v.(*gorm.DB); ok && tx != nil {
+			return tx
+		}
+	}
+	return base
+}
+
+type TxManager struct {
+	db *gorm.DB
+}
+
+func NewTxManager(db *gorm.DB) *TxManager { return &TxManager{db: db} }
+
+// WithTransaction runs fn inside a DB transaction, injecting the *gorm.DB tx into ctx.
+func (m *TxManager) WithTransaction(ctx context.Context, fn func(ctx context.Context) error) error {
+	return m.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		ctxTx := context.WithValue(ctx, txKey, tx)
+		return fn(ctxTx)
+	})
+}