Got it to work!
I just needed one [[+betaling.0]] in the email template.
Template:
[[+betaling.0]]
Snippet:
[[!FormIt?
&hooks=`spam,email,redirect`
&emailTpl=`sentEmailTpl`
&emailSubject=`Bestelling`
&emailTo=`
[email protected]`
&redirectTo=`2183`
&validate=`email:email:required,
betaling:required`
]]
Radios:
<input type="radio" value="bank" name="betaling[]" [[!+fi.betaling:FormItIsChecked=`bank`]] id="bank" />
<input type="radio" value="paypal" name="betaling[]" [[!+fi.betaling:FormItIsChecked=`paypal`]] id="paypal" />
