ServiceM8's native integration with Stripe is powerful and feature rich. Stipe offers a well documented, stable and widely used payment gateway which is easy for even novice teams to set up and use for processing customer payments. They also offer a deep API which ServiceM8 leverages to provide a powerful solution for your company.
Why only Stripe?
While we do not work for ServiceM8, we can make some assumptions on this point. Stripe is a powerful and feature rich solution, and while there are other options out there, as soon as they offer additional options, people will feel like they need to be catered to if their preferred option is not provided.
Additionally a single option makes it easier to provide better and more reliable support, quicker updates when systems change, and easier to innovate.