Region, tier and length: reading a Netflix listing
Three fields decide whether a Netflix offer fits you. The region has to match the country on your profile, the tier sets screens and resolution, and the length tells you when you will pay again. Every offer in Netflix plans and gift cards lists all three before checkout.
A gift card skips the tier question: it adds balance and Netflix draws your chosen plan from it each month. If you also pay for music, the Spotify hub lists Premium time on the same terms.