Other than one thread on the other forum, I can't find any information on the digital pass (in relation to season ticket renewals). There is no additional charge when choosing this option to renew STs, whilst it's £2.50 to keep your existing ST card and £5 for a new one (both these also have the digital pass). Is the digital pass therefore a barcode on an app, to be shown at the turnstile via your mobile, rather than the ST card?