Develop plugins for wordpress/appointment+ - repost

We are looking at developing plugins for appointments+/marketpress for our wordpress [login to view URL] are for our existing websites. Scope is as follows: a)Sms gateway integration to carry order details There are 2 different sms gateways to be integrated with the e commerce/booking plugin We prefer development as plugins as can be deployed across multiple sites b)Payment gateway to be integrated as plugin-payu India c)Email notification to be expanded-currently the standard email notifier carries only the notification we want order details to be notified. Schedule 1 week Payment via escrow upon completion of the project successfully.