Hi, i have read your project description, and i understand what you want. I have strong knowledge of Magento, and plenty of experience with it, so i can simply deliver Magento module, that will do exactly this. Magento already has so called "Magento API" (you can simply google it, it's first result), which allows processing of remote calls via REST and or SOAP. Changing of configuration is not avaialable remotely, but i can implement it with the mentioned custom module. Feel free to contact me by private message to discuss details of this project. I'm looking forward to our cooperation.