All transactions on Sent.ly, credit top-up or monthly subscriptions, are done through a convenient & secure payment gateway.
We have Sent.ly installed in more than 20 countries around the world to deliver notifications to our customers. We've had very high availability from Sent.ly along with excellent developer support from the team!
We use Sent.ly to get status reports from our vehicle mounted tracking system. The Sent.ly system automatically receives reports sent in over SMS, and forwards them up to our back-end. We've pretty much forgotten about the system once it has been integrated - it's that good!