iOS: where's 'Send gift card by email'?

I want to send my mom a gift card for the cost of increased iCloud storage she’s now using. I was able to do it last year using the instructions in this Apple support document but it appears to no longer be valid; the options shown don’t appear in the latest version of iOS

Did Apple squirrel away this ability somewhere else, or do I need to use the feature on Apple’s site?

I’ve always done it through the Apple Store app