I'm developing an integration application between my city's prefecture and a system for a company, for optimization of NFS-e generation. It consists of using the City's Web Service to send, using SOAP, XML files to be validated. That is, the passed parameter will be an XML file.
Since I've never created such an application, I'm in doubt as to how to do this. For example:
How do I use the services provided ( link ) and do SOAP communication in PHP? Assuming I have the XML file ready and structured correctly, how do I pass it as a parameter to the Web Service services?
I do not want the solution of anything, only tips and examples that can help me.