Need an android developer for a one-time gig. Possible recurring work afterwards if results are good.

I need to have an app made for me to use in my company. I need it to organize my work schedule, to do planning, to send out text-messages, to save and pull data from a database and to send out payment requests through a Danish payment service called "MobilePay". MobilePay has a public API which you should be able to find with a simple search. Basically what I need is my work-sheet in a digital format. I am a window cleaner. Right now I have a system on my computer which handles the customer, the routes, the planning and everything else. Every week I print out a route on paper, that I need to finish during that week. On that paper I write down what day each costumer has been serviced, any changes that may come, new customers, whether the customer paid cash, and everything else that might come up. When I get home I manually input all of it into our system on my computer. I'd like to have that done automatically. Our system is able to import pretty much anything in any format, so as long as you can get it up on a server, we are able to use it. There are other things I'd like the app to be able to do but this is the brunt of it. In the later stages I'd also like to incorporate MobilePay into the app, along with other features too. But that can come later, if we are satisfied with your work on the first part. I imagine that if you are able, and interested, there will be quite a bit of maintenance and upkeep on the app in the future, along with updates and additions, so there should be some work for quite a while if we are happy with each other. Let me know what you can do. Please mention MobilePay in your application so I know you have read through it all.