COD-Cash on delivery have various payment mode -Cash/Cheque/Demand draft /Partial Payment . 

To avail partial payment option,customer are suggested to book their parcel with partial payment amount . But while handing over parcel to pick up guy they need to provide 2 invoice- one with full amount and other authorising partial payment collection . AWB should contain only that amount which needs to be collected from consignee . 

Many courier companies have restriction of COD cash collection amount upto INR 20,000. In such cases we suggest our clients to collect balance amount from their customers via any alternate mode(Online transfer ,etc) and process COD only upto INR 20,000.