Retrieving LINE stamps and emojis via API

Hello, We're currently designing a server-side application that involves retrieving LINE stickers and emojis via API. So far, I haven't found anything in LINE docs that mentions this. Instead, in this page: https://developers.line.biz/en/docs/messaging-api/sticker-list/#sticker-definitions

When I try to use developer tools, it seems that it is fetching the stickers at this endpoint: https://stickershop.line-scdn.net/stickershop/v1/sticker/<StickerID>/android/sticker.png

And for the iphone version https://stickershop.line-scdn.net/stickershop/v1/sticker/<StickerID>/iPhone/sticker_key.png

Examples: https://stickershop.line-scdn.net/stickershop/v1/sticker/52114148/android/sticker.png https://stickershop.line-scdn.net/stickershop/v1/sticker/52114148/iPhone/sticker_key.png

For those who are familiar with this, is this endpoint official? Would there be any limits that we need to consider if we use this?