TPV (third party verification) is a procedure of having an independent third party verify, that a client is actually ordering a new service or product or requesting a change.

The TPV provider asks the customers:
1. To identify themselves
2. To identify the order information
3. To verify if they are authorized to place the orders

Companies such as long distance providers and telemarketing organizations are required by law to use a TPV “third party verification” service while selling products or services over the telephone.