Earlier this week the streaming hi-fi hardware maker Sonos announced that it was opening up its API (Application Programming Interface) so that music services could build apps - and those already include Spotify.

BBC: Spotify goes apptastic

To that end, WePay has also opened up its application programming interface (API) to allow its community of third-party developers to create new products based off of its service.

FORBES: WePay Launches GroupOn Competitor