Hi Lauren,
As has been mentioned, Weybridge is beyond the contactless area at the moment, and sadly isn’t included in the extension planned for next month. Your options would appear to be:
Weybridge to Zones U123 London is £26.40 return (£17.40 with railcard)
Weybridge to Wimbledon is £12.60 return (£12.00 with railcard) plus 2x£3.70 PAYG singles.
So, thanks to the £12 minimum fare before 10am, you’d be better off buying the through return.