hi
As far as I can tell on wishcard.ch, Digitec is not included. I would recommend
in case of doubt to take a Digitec-Galaxus voucher. E.g. this one:

Digital voucher CHF 100.-

I tried to use a Wishcard card with Digitec, but the code is not accepted. I think that this company only accepts Wishcard cards issued by Digitec. C'est assez trompeur.
I received CHF 150 in Wishcard, but I couldn't use it at Digitec. Apparently only Wishcards issued by Digitec are accepted. Not very fair.