G cluster_1 Legend XYZ-9 XYZ-9 Define Purchases API XYZ-6 XYZ-6 Implement Purchases API endpoints XYZ-9->XYZ-6 XYZ-2 XYZ-2 Implement Product model XYZ-5 XYZ-5 Implement Products API endpoints XYZ-2->XYZ-5 XYZ-2->XYZ-6 XYZ-7 XYZ-7 Define Users API XYZ-4 XYZ-4 Implement Users API endpoints XYZ-7->XYZ-4 XYZ-10 XYZ-10 Display available products XYZ-5->XYZ-10 XYZ-8 XYZ-8 Define Products API XYZ-8->XYZ-5 XYZ-11 XYZ-11 Sign up & Sign in XYZ-4->XYZ-11 XYZ-13 XYZ-13 Acceptance Test XYZ-10->XYZ-13 XYZ-3 XYZ-3 Implement Purchase model XYZ-12 XYZ-12 Allow users to create and see purchases XYZ-6->XYZ-12 XYZ-11->XYZ-13 XYZ-12->XYZ-13 XYZ-1 XYZ-1 Imlpement User model XYZ-1->XYZ-4 XYZ-1->XYZ-3 XYZ-1->XYZ-6 Common Common Backend Backend Frontend Frontend