I changed my credit card and now can't buy lindens in my viewer (Phoenix) It directs me to the web

[Randall Razor]

There doesn't appear to be a place to set up ability to buy thru viewer on the site

[Venus Petrov]

Even if you had not changed your cc, sometimes the purchase process is borked and the only way to purchase is to do via the website.  This is likely just a temporary glitch that will sort itself out.  Be patient.