Retrieving info from various services
I see numerous applications that retrieve information from various services. For example, applications tracking the progress of delivery of packages from a whole bunch of services, such as DHL, UPS, and many more. So far, I have been unable to find open protocols for retrieving this sort of information. So, how do they do it? Do they have "connections"? Do they simply parse the HTML pages that report this kind of information to users? Any ideas? Also interested in retrieving (and making changes to) information on mobile phone accounts.
Thank you.
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