Apply monthly dues

api/api.go

api/api_test.go

api/auth.go

api/db/dues.go

api/db/errors.go

api/db/member.go

api/db/order.go

api/db/transaction.go

api/dues.go

api/dues_test.go

api/order.go

api/purchase.go

api/topup.go

main.go

src/App.js

src/AuthContext.js

src/Dashboard.js

src/Head.js

src/Panel.js

src/dues/DuesList.js