This is one post that probably should have come a lot sooner, but it's perfectly fine to be made now with consideration of the understanding gained for the aspect. As with other mobile Pokémon games, TCGP also has a set of currencies for many of its usual functions, or at least items that act as such and in one case can be procured by exchanging real money, making them a "proxy" for it. These items and currencies as such deserves a bit of discussion.
Players would surely frequently encounter the shop tickets, since they'd earn them through Wonder Picks, certain missions, and "thanks" received from other players for various actions. They can be used to purchase Wonder Pick and pack hourglasses at the shop as well as some cards and card accessories, and they can also be exchanged for special shop tickets to obtain "luxury" items, which also command "luxurious" prices. Their usage would also be as frequent as the ways players would receive the currency.
Meanwhile, the "shinedust" item and currency has recently gained prominence as well. This is gained from duplicate cards and certain missions, and was initially used (along with exchanges of those duplicate cards) to obtain "flair", as special effects for cards. Further, it is also what replaces the trade tokens that were formerly used as trading "currency", and existing tokens can be converted into this currency and pack hourglasses as well. Fans will also note a certain parallel of this item and currency to the Stardust of Pokémon Go that fulfill nearly the same role, which is brought about by the simplification as above.
Earlier in my discussion about "warping time" with hourglasses, I had also mentioned the Poké gold item, and this item too in effect acts as a "currency", since putting in money into the game means purchasing the item through the shop's "Purchase Poké gold" section. Besides for recovering pack and Wonder Pick stamina, they can also be used to recover trade and battle stamina at different rates, but they will certainly be used more for the former, since those would be considered primary and frequent actions for many players.
Arguably, there is a currency item for all kinds of functions in TCGP, and the earning and exchanging of them can be considered very much a part of the gameplay, as is using the cards in actual card battles much like in Pokémon TCG proper. Like real currencies and those in other games, understanding their necessity and wisdom is part of the key to many endeavors, even in this game that is a take on the Pokémon TCG and its associated exchanges.
One year ago: Immersive Cards in TCG Pocket
Two years ago: Focus and Control: Two Keys to Pokémon Power
Three years ago: Scarlet and Violet Unleashed
Four years ago: Living Further with My Buddy
Five years ago: Pokémon "Genealogy"
Six years ago: Drafts Piling Up
Seven years ago: Trough of Disillusionment
Eight years ago: A Little Teaser... and Guessing Game