Super-simple templates:

template 'account/api_key' => sub {
    wrapper {
        h2 { 'API key' };
        p { outs("Your new API key is: ");
            tt { c->stash->{key} };
        };
        p { "Any other keys will continue to work until you deactivate them." };
    }
};

template 'account/cleared_keys' => sub {
    wrapper {
        h2 { 'API keys deleted' };
        p { "All API keys associated with your account have been ".
              "deactivated."
          };
    }
};