The present invention provides methods and systems for processing bills electronically. Generally, a bill is created for a customer using billing information and master data from a biller and master data from a customer. Billing information is received from the biller by a first processing module having access to the master data of the biller. The first processing module generates a bill using the billing information and the master data of the biller. A second processing module having access to the master data of the customer provides customer data to the first processing module. The bill is transformed into a format specified in the master data of the customer by the first processing module if the format of the generated bill is not the format specified in the master data of the customer. The generated or transformed bill is transferred to the second processing module by the first processing module.