With Bizum, you can pay in online stores that offer Bizum as a payment method. You just need to choose the "Pay with Bizum" option.
Check here for the stores that accept Bizum payments.
Young people aged 12 and over can have Bizum with the MoraBanc app. The minor just needs to be the holder of an account at MoraBanc, and their parent or legal guardian must register them on MoraBanc Digital by linking their mobile phone number to the account.