how do I get permission to pentest a cafe wifi?

So if I know of a coffee shop with WPA2 encryption, how do I get permission to pentest it? Who do I talk to? What do I say? Is there like an email? I'm assuming people are generally gonna say no right? How do I get someone to say "yes, you can pentest our wifi?" by HowToHack on Reddit.com how do I get permission to pentest a cafe wifi? - So if I know of a coffee shop with WPA2 encryption, how do I get permission to pentest it? Who do I talk to? What do I say? Is there like an email? I'm assuming people are generally gonna say no right? How do I get someone to say "yes, you can pentest our wifi?"

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