Added shared projects

LiteCharms.Features/Customers/Commands/Handlers/RefundCustomerCommandHandler.cs

@@ -0,0 +1,38 @@
+using LiteCharms.Infrastructure.Database;
+
+namespace LiteCharms.Features.Customers.Commands.Handlers;
+
+public class RefundCustomerCommandHandler(IDbContextFactory<LeadGeneratorDbContext> contextFactory) : IRequestHandler<RefundCustomerCommand, Result<Guid>>
+{
+    public async ValueTask<Result<Guid>> Handle(RefundCustomerCommand request, CancellationToken cancellationToken)
+    {
+		try
+		{
+            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);
+
+            if(!await context.Orders.AnyAsync(o => o.Id == request.OrderId, cancellationToken))
+                return Result.Fail<Guid>(new Error($"Order with Id: {request.OrderId} does not exist"));
+
+            if (!await context.Customers.AnyAsync(c => c.Id == request.CustomerId, cancellationToken))
+                return Result.Fail<Guid>(new Error($"Customer with Id: {request.CustomerId} does not exist"));
+
+            if(!await context.Orders.AnyAsync(o => o.Id == request.OrderId && o.CustomerId == request.CustomerId, cancellationToken))
+                return Result.Fail<Guid>(new Error($"Order with Id: {request.OrderId} does not belong to Customer with Id: {request.CustomerId}"));
+
+            var refund = context.OrderRefunds.Add(new Entities.OrderRefund
+            {
+                OrderId = request.OrderId,
+                Reason = request.Reason,
+                Amount = request.Amount
+            });
+
+            return await context.SaveChangesAsync(cancellationToken) > 0
+                ? Result.Ok(refund.Entity.Id)
+                : Result.Fail<Guid>(new Error($"Failed to create refund for OrderId: {request.OrderId}"));
+        }
+		catch (Exception ex)
+		{
+            return Result.Fail<Guid>(new Error(ex.Message).CausedBy(ex));
+        }
+    }
+}