Biller- An entity that bills a Customer.

Customer- The party that receives the bill.  Could be a consumer or a business.

Biller Service Provider (BSP) - An agent of the Biller that provides services such as bill formatting, data parsing, bill hosting and bill consolidation.

Customer Service Provider (CSP) - An agent of the Customer that provides service access. Could be a personal finance management software, direct banking site, or a Customer aggregator

Biller Payment Provider (BPP) - Processes payment and remittance information on behalf of the Biller.

Customer Payment Provider (CPP)- Processes payment and remittance information on behalf of the Customer, could be the Customer's bank or a third party.

Payment/Remittance Network(s)- Transfers payment and remittance information between the BPP and CPP.