I'm have a camping/resort/rv website that uses PHP's native SoapClient
class to request availability for units within a resort. The end users
fill out a form indicating the type of unit they would like, dates, number
of adults, etc things like that, and then we use that data in the SOAP
request. Most of the time, it works as expected.
There have been reports where a user is checking availability on a unit but the data returned indicates none are available. Then, if they switch to a new browser, and do the same search over, it's showing that they ARE in fact available.