...

Back/Services/ServPromotion.cs

@@ -37,5 +37,11 @@ namespace Back.Services
                     }).ToList()
                 }).ToListAsync();
         }
+        public async Task<Promotion> GetByPromotionID(int PromotionID)
+        {
+            return await _repoPromotion.Get(w => w.Status && w.ID == PromotionID)
+               .Include(inc => inc.PromotionDetails).ThenInclude(tinc => tinc.Permission)
+               .FirstOrDefaultAsync();
+        }
     }
 }