Abstract: An improved system and method for managing payment transactions whereby a paying entity and payment receiving entity perform the payment transaction using a transaction server of a payment management service provider that receives a keyword and performs a sequence of steps corresponding to a transaction scenario of a plurality of transaction scenarios corresponding to the keyword. As part of the sequence of steps the transaction server calls a phone of the paying entity to receive payment information that is provided using a keypad or voice commands. The transaction server provides the payment information to a payment processing service provider to authorize the transaction and provides transaction authorization information received from the payment processing service provider to the paying entity and payment receiving entity.