diff --git a/.gitignore b/.gitignore
index bf7c8b0..ac9ff9d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -50,3 +50,4 @@ Thumbs.db
 .idea/
 *.swp
 *.swo
+client_secret.json
diff --git a/backend/TRFSAE.MemberPortal.API/Controllers/PurchaseRequestController.cs b/backend/TRFSAE.MemberPortal.API/Controllers/PurchaseRequestController.cs
new file mode 100644
index 0000000..efc91f0
--- /dev/null
+++ b/backend/TRFSAE.MemberPortal.API/Controllers/PurchaseRequestController.cs
@@ -0,0 +1,54 @@
+using Microsoft.AspNetCore.Mvc;
+using TRFSAE.MemberPortal.API.DTOs;
+using TRFSAE.MemberPortal.API.Interfaces;
+using Supabase;
+
+namespace TRFSAE.MemberPortal.API.Controllers
+{
+    [ApiController]
+    [Route("api/purchase-request")]
+    public class PurchaseRequestController : ControllerBase
+    {
+        private readonly IPurchaseRequestService _purchaseRequestService;
+
+        public PurchaseRequestController(IPurchaseRequestService purchaseRequestService)
+        {
+            _purchaseRequestService = purchaseRequestService;
+        }
+
+        [HttpGet]
+        public async Task<IActionResult> GetAllPurchaseAsync([FromQuery] PurchaseRequestSearchDto? dto)
+        {
+            var result = await _purchaseRequestService.GetAllPurchaseRequestsAsync(dto ?? new PurchaseRequestSearchDto());
+            return Ok(result);
+        }
+
+        [HttpGet("{id:guid}", Name = "GetPurchaseRequestById")]
+        public async Task<IActionResult> GetPurchaseRequestByIDAsync(Guid id)
+        {
+            var item = await _purchaseRequestService.GetPurchaseRequestByIDAsync(id);
+            return item is null ? NotFound() : Ok(item);
+        }
+
+        [HttpPost]
+        public async Task<IActionResult> CreatePurchaseRequestAsync(PurchaseRequestCreateDto dto)
+        {
+            var created = await _purchaseRequestService.CreatePurchaseRequestAsync(dto);
+            return CreatedAtRoute("GetPurchaseRequestById", new { id = created.Id }, created);
+        }
+
+        [HttpPut("{id:guid}")]
+        public async Task<IActionResult> UpdatePurchaseRequestByIDAsync(Guid id, PurchaseRequestUpdateDto dto)
+        {
+            var updated = await _purchaseRequestService.UpdatePurchaseRequestByIDAsync(id, dto);
+            return updated is null ? NotFound() : Ok(updated);
+        }
+
+        [HttpDelete("{id:guid}")]
+        public async Task<IActionResult> DeletePurchaseRequestAsync(Guid id, string confirmationString)
+        {
+            var deleted = await _purchaseRequestService.DeletePurchaseRequestAsync(id, confirmationString);
+            return deleted ? NoContent() : NotFound();
+        }
+    }
+}
diff --git a/backend/TRFSAE.MemberPortal.API/DTOs/PurchaseRequest/PurchaseRequestCreateDto.cs b/backend/TRFSAE.MemberPortal.API/DTOs/PurchaseRequest/PurchaseRequestCreateDto.cs
new file mode 100644
index 0000000..7ade908
--- /dev/null
+++ b/backend/TRFSAE.MemberPortal.API/DTOs/PurchaseRequest/PurchaseRequestCreateDto.cs
@@ -0,0 +1,8 @@
+namespace TRFSAE.MemberPortal.API.DTOs
+{
+    public class PurchaseRequestCreateDto
+    {
+        public string Status { get; set; } = string.Empty;
+        public Guid Requester { get; set; }
+    }
+}
diff --git a/backend/TRFSAE.MemberPortal.API/DTOs/PurchaseRequest/PurchaseRequestResponseDto.cs b/backend/TRFSAE.MemberPortal.API/DTOs/PurchaseRequest/PurchaseRequestResponseDto.cs
new file mode 100644
index 0000000..e2f5d5c
--- /dev/null
+++ b/backend/TRFSAE.MemberPortal.API/DTOs/PurchaseRequest/PurchaseRequestResponseDto.cs
@@ -0,0 +1,22 @@
+using System.Text.Json.Serialization;
+
+namespace TRFSAE.MemberPortal.API.DTOs
+{
+    public class PurchaseRequestResponseDto
+    {
+        [JsonPropertyName("id")]
+        public Guid Id { get; set; }
+
+        [JsonPropertyName("status")]
+        public string Status { get; set; } = string.Empty;
+
+        [JsonPropertyName("requester")]
+        public Guid? Requester { get; set; }
+
+        [JsonPropertyName("created_at")]
+        public DateTimeOffset CreatedAt { get; set; }
+
+        [JsonPropertyName("updated_at")]
+        public DateTime UpdatedAt { get; set; }
+    }
+}
diff --git a/backend/TRFSAE.MemberPortal.API/DTOs/PurchaseRequest/PurchaseRequestSearchDto.cs b/backend/TRFSAE.MemberPortal.API/DTOs/PurchaseRequest/PurchaseRequestSearchDto.cs
new file mode 100644
index 0000000..8554c1b
--- /dev/null
+++ b/backend/TRFSAE.MemberPortal.API/DTOs/PurchaseRequest/PurchaseRequestSearchDto.cs
@@ -0,0 +1,8 @@
+namespace TRFSAE.MemberPortal.API.DTOs
+{
+    public class PurchaseRequestSearchDto
+    {
+        public string Status { get; set; } = string.Empty;
+        public Guid? Requester { get; set; }
+    }
+}
diff --git a/backend/TRFSAE.MemberPortal.API/DTOs/PurchaseRequest/PurchaseRequestUpdateDto.cs b/backend/TRFSAE.MemberPortal.API/DTOs/PurchaseRequest/PurchaseRequestUpdateDto.cs
new file mode 100644
index 0000000..58a634e
--- /dev/null
+++ b/backend/TRFSAE.MemberPortal.API/DTOs/PurchaseRequest/PurchaseRequestUpdateDto.cs
@@ -0,0 +1,8 @@
+namespace TRFSAE.MemberPortal.API.DTOs
+{
+    public class PurchaseRequestUpdateDto
+    {
+        public string Status { get; set; } = string.Empty;
+        public Guid Requester { get; set; }
+    }
+}
diff --git a/backend/TRFSAE.MemberPortal.API/Interfaces/IPurchaseRequestService.cs b/backend/TRFSAE.MemberPortal.API/Interfaces/IPurchaseRequestService.cs
new file mode 100644
index 0000000..40b6833
--- /dev/null
+++ b/backend/TRFSAE.MemberPortal.API/Interfaces/IPurchaseRequestService.cs
@@ -0,0 +1,13 @@
+using TRFSAE.MemberPortal.API.DTOs;
+
+namespace TRFSAE.MemberPortal.API.Interfaces
+{
+    public interface IPurchaseRequestService
+    {
+        Task<List<PurchaseRequestResponseDto>> GetAllPurchaseRequestsAsync(PurchaseRequestSearchDto dto);
+        Task<PurchaseRequestResponseDto> GetPurchaseRequestByIDAsync(Guid id);
+        Task<PurchaseRequestResponseDto> CreatePurchaseRequestAsync(PurchaseRequestCreateDto dto);
+        Task<PurchaseRequestResponseDto> UpdatePurchaseRequestByIDAsync(Guid id, PurchaseRequestUpdateDto dto);
+        Task<bool> DeletePurchaseRequestAsync(Guid id, string confirmationString);
+    }
+}
diff --git a/backend/TRFSAE.MemberPortal.API/Models/PurchaseRequestModel.cs b/backend/TRFSAE.MemberPortal.API/Models/PurchaseRequestModel.cs
new file mode 100644
index 0000000..61d8e19
--- /dev/null
+++ b/backend/TRFSAE.MemberPortal.API/Models/PurchaseRequestModel.cs
@@ -0,0 +1,24 @@
+using Supabase.Postgrest.Attributes;
+using Supabase.Postgrest.Models;
+
+namespace TRFSAE.MemberPortal.API.Models
+{
+    [Table("purchase_request")]
+    public class PurchaseRequestModel: BaseModel
+    {
+        [PrimaryKey("id", false)]
+        public Guid Id { get; set; }
+
+        [Column("status")]
+        public string Status { get; set; } = string.Empty;
+
+        [Column("requester")]
+        public Guid Requester { get; set; }
+
+        [Column("created_at")]
+        public DateTimeOffset CreatedAt { get; set; }
+
+        [Column("updated_at")]
+        public DateTime UpdatedAt { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/backend/TRFSAE.MemberPortal.API/Program.cs b/backend/TRFSAE.MemberPortal.API/Program.cs
index 3df84b0..04e68aa 100644
--- a/backend/TRFSAE.MemberPortal.API/Program.cs
+++ b/backend/TRFSAE.MemberPortal.API/Program.cs
@@ -12,6 +12,8 @@
     builder.Services.AddScoped<IRoleService, RoleService>();
     builder.Services.AddScoped<ITaskService, TaskService>();
     builder.Services.AddScoped<IProjectService, ProjectService>();
+    builder.Services.AddScoped<IPurchaseItemService, PurchaseItemService>();
+    builder.Services.AddScoped<IPurchaseRequestService, PurchaseRequestService>();
     builder.Services.AddScoped<IGoogleSheetsService, GoogleSheetsService>();
 }
 
@@ -35,20 +37,6 @@
     return client;
 });
 
-// register Supabase client as a singleton for reuse across project
-builder.Services.AddScoped(provider =>
-{
-    var options = new SupabaseOptions
-    {
-        AutoConnectRealtime = true,
-        AutoRefreshToken = true,
-    };
-
-    var url = builder.Configuration["SupabaseUrl"] ?? throw new InvalidOperationException("Supabase URL is not configured.");
-    var key = builder.Configuration["SupabaseKey"] ?? throw new InvalidOperationException("Supabase Key is not configured.");
-    return new Client(url, key, options);
-});
-
 // Add services to the container.
 // Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
 builder.Services.AddEndpointsApiExplorer();
@@ -81,12 +69,22 @@
 app.UseHttpsRedirection();
 app.UseAuthorization();
 app.MapControllers();
-using (var scope = app.Services.CreateScope())
-{
-    var googleSheetsService = scope.ServiceProvider.GetRequiredService<IGoogleSheetsService>();
 
-    // Initialize Google Sheets API once
-    await googleSheetsService.ListenToSupabaseChangesAsync();
-}
+// Initialize Google Sheets listener after app is built
+app.Lifetime.ApplicationStarted.Register(async () =>
+{
+    using (var scope = app.Services.CreateScope())
+    {
+        var googleSheetsService = scope.ServiceProvider.GetRequiredService<IGoogleSheetsService>();
+        try
+        {
+            await googleSheetsService.ListenToSupabaseChangesAsync();
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"Error initializing Google Sheets listener: {ex.Message}");
+        }
+    }
+});
 
 app.Run();
diff --git a/backend/TRFSAE.MemberPortal.API/Services/GoogleSheetsService.cs b/backend/TRFSAE.MemberPortal.API/Services/GoogleSheetsService.cs
index dabc834..e98055a 100644
--- a/backend/TRFSAE.MemberPortal.API/Services/GoogleSheetsService.cs
+++ b/backend/TRFSAE.MemberPortal.API/Services/GoogleSheetsService.cs
@@ -84,22 +84,30 @@ public async Task<List<SheetsResponseDTO>> GetSupabase()
 
         public async Task ListenToSupabaseChangesAsync()
         {
-            var channel = await _supabaseClient
-                .From<PurchaseItemModel>()
-                .On(Supabase.Realtime.PostgresChanges.PostgresChangesOptions.ListenType.Inserts, async (sender, change) =>
-                {
-                    var items = await GetSupabase();
-                    if (items != null && items.Count > 0)
-                    {
-                        CreateEntry(items);
-                    }
-                   else
+            try
+            {
+                var channel = await _supabaseClient
+                    .From<PurchaseItemModel>()
+                    .On(Supabase.Realtime.PostgresChanges.PostgresChangesOptions.ListenType.Inserts, async (sender, change) =>
                     {
-                        Console.WriteLine(" No item found to write to Google Sheets");
-                    } 
-                });
+                        var items = await GetSupabase();
+                        if (items != null && items.Count > 0)
+                        {
+                            CreateEntry(items);
+                        }
+                        else
+                        {
+                            Console.WriteLine("No item found to write to Google Sheets");
+                        }
+                    });
 
-            await channel.Subscribe();
+                await channel.Subscribe();
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error in ListenToSupabaseChangesAsync: {ex.Message}");
+                throw;
+            }
         }
 
     }
diff --git a/backend/TRFSAE.MemberPortal.API/Services/PurchaseRequestService.cs b/backend/TRFSAE.MemberPortal.API/Services/PurchaseRequestService.cs
new file mode 100644
index 0000000..774db7d
--- /dev/null
+++ b/backend/TRFSAE.MemberPortal.API/Services/PurchaseRequestService.cs
@@ -0,0 +1,140 @@
+using TRFSAE.MemberPortal.API.DTOs;
+using TRFSAE.MemberPortal.API.Interfaces;
+using TRFSAE.MemberPortal.API.Models;
+using System.Text.Json;
+using Supabase;
+
+namespace TRFSAE.MemberPortal.API.Services
+{
+    public class PurchaseRequestService : IPurchaseRequestService
+    {
+        private readonly Client _supabaseClient;
+
+        public PurchaseRequestService(Client supabaseClient)
+        {
+            _supabaseClient = supabaseClient;
+        }
+
+        private PurchaseRequestResponseDto MapToDto(PurchaseRequestModel model)
+        {
+            return new PurchaseRequestResponseDto
+            {
+                Id = model.Id,
+                Status = model.Status,
+                Requester = model.Requester,
+                CreatedAt = model.CreatedAt,
+                UpdatedAt = model.UpdatedAt
+            };
+        }
+
+        private PurchaseRequestModel MapToModel(PurchaseRequestCreateDto dto)
+        {
+            return new PurchaseRequestModel
+            {
+                Status = dto.Status,
+                Requester = dto.Requester
+            };
+        }
+
+        public async Task<List<PurchaseRequestResponseDto>> GetAllPurchaseRequestsAsync(PurchaseRequestSearchDto dto)
+        {
+            var response = await _supabaseClient
+                .From<PurchaseRequestModel>()
+                .Get();
+
+            var results = response.Models.AsEnumerable();
+
+            if (!string.IsNullOrWhiteSpace(dto.Status))
+            {
+                results = results.Where(x => x.Status == dto.Status);
+            }
+
+            if (dto.Requester.HasValue && dto.Requester != Guid.Empty)
+            {
+                results = results.Where(x => x.Requester == dto.Requester);
+            }
+
+            return results.Select(MapToDto).ToList();
+        }
+
+        public async Task<PurchaseRequestResponseDto> GetPurchaseRequestByIDAsync(Guid id)
+        {
+            var response = await _supabaseClient
+                .From<PurchaseRequestModel>()
+                .Where(x => x.Id == id)
+                .Single();
+
+            if (response == null)
+            {
+                throw new Exception("Purchase request not found");
+            }
+
+            return MapToDto(response);
+        }
+
+        public async Task<PurchaseRequestResponseDto> CreatePurchaseRequestAsync(PurchaseRequestCreateDto dto)
+        {
+            var newModel = MapToModel(dto);
+            if (newModel.Id == Guid.Empty) 
+                newModel.Id = Guid.NewGuid();
+            if (newModel.CreatedAt == default) 
+                newModel.CreatedAt = DateTimeOffset.UtcNow;
+
+            var response = await _supabaseClient
+                .From<PurchaseRequestModel>()
+                .Insert(new List<PurchaseRequestModel> { newModel });
+
+            if (response.Models is null || response.Models.Count == 0)
+                throw new Exception("Failed to create purchase request");
+
+            return MapToDto(response.Models.First());
+        }
+
+        public async Task<PurchaseRequestResponseDto> UpdatePurchaseRequestByIDAsync(Guid id, PurchaseRequestUpdateDto dto)
+        {
+            var currentRequest = await _supabaseClient
+                .From<PurchaseRequestModel>()
+                .Where(x => x.Id == id)
+                .Single();
+
+            if (currentRequest == null)
+                throw new Exception("Purchase request not found");
+
+            if (!string.IsNullOrWhiteSpace(dto.Status))
+                currentRequest.Status = dto.Status;
+            
+            if (dto.Requester != Guid.Empty)
+                currentRequest.Requester = dto.Requester;
+            
+            currentRequest.UpdatedAt = DateTime.UtcNow;
+
+            var response = await _supabaseClient
+                .From<PurchaseRequestModel>()
+                .Update(currentRequest);
+
+            if (response.Models is null || response.Models.Count == 0)
+                throw new Exception("Failed to update purchase request");
+
+            return MapToDto(response.Models.First());
+        }
+
+        public async Task<bool> DeletePurchaseRequestAsync(Guid id, string confirmationString)
+        {
+            if (confirmationString != "confirm")
+                return false;
+
+            try
+            {
+                await _supabaseClient
+                    .From<PurchaseRequestModel>()
+                    .Where(x => x.Id == id)
+                    .Delete();
+                return true;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+    }
+}
\ No newline at end of file