Systems and methods are provided to facilitate online transactions via mobile communications. In one aspect, a system includes an interchange coupled with a data storage facility. The interchange includes a common format processor and a plurality of converters to interface with a plurality of different controllers of mobile communications. The converters are configured to communicate with the controllers in different formats and to communicate with the common format processor in a common format. The common format processor is to instruct a first controller of the controllers, via a first converter of the converters, to communicate with a mobile phone at a mobile phone number of a user to confirm a request to add funds to an account of a user, if the user has not yet provided an advance authorization. If the user has provided the advance authorization, the interchange skips communications with the mobile phone to confirm the request.