In Case of Companies
AP Department is of 2 types
1.OPEX Department
2,CAPEX Department
Opex Dept deals with Normal Expenses like Purchase,Office Exp,Salary and Other Direct and Indirect expenses
Capex Dept deals with Purchase of Fixed Assets like Machinery,Building etc as well as their expenses of Capitaization like Machine Installation expenses,Building Construction expenses etc
Vendor payments can be in case of both OPEX and CAPEX
(AP Process is Similar for both CAPEX AND OPEX)