Piwik monitor multiple sites, how to generate a token for each site

Dear All:
Using Piwik to monitor multiple client sites, if you use idSite to
distinguish between different sites, if the customer to modify the
idSite value, so you can get other sites are listening, how to solve
this problem?

Hi there,

please see solution: How do I force Piwik to only track Page URLs that belong to my website?