call a webservice from an endpoint and get the forwarded data

hi everyone i am working on a web program (with PHP) that can receive data forwarded from server via a web service ...

The webservice (providing the SendData method) is designed to work as an endpoint service, that means data will be uploaded to that service. The service is not designed to request data from our servers! The workflow is as follows: The Machine sends data to our Example server which forwards the data to the endpoint service (that one that you develop) by calling the SendData method. Therefore your service must be accessible from external (our server) so your need a port forward in your firewall and an static address (e.g. http://ift.tt/1WveKTY).

but i have no idea how to do any of that i don't have any experience in this it's my first time so can anyone give a very detailed explanation about what should i do and how