Some products arrive as a code, others are sent to your player ID. Here is how each one works.
On JR you will see two kinds of products: gift cards and top-ups. Both add value to a game or platform, but they arrive differently.
You receive a code. You redeem it yourself on the official site or app, and the value goes to your account wallet. Examples: Steam, PlayStation, Xbox, Apple.
You give your player ID, and the in-game currency is sent to that player. Examples: PUBG Mobile UC, Free Fire diamonds, Mobile Legends diamonds.
The brand page on JR says whether a product is a gift card or a top-up.