How to buy crown by third games?

Excuse me, could you please clarify the process for purchasing Crown tokens through Third Games? I'm a bit unfamiliar with the specific steps involved and I'd like to understand the entire process from start to finish. Could you walk me through the necessary actions, including any prerequisites or verifications that may be required? Additionally, are there any fees associated with the purchase, and if so, how are they calculated? I appreciate your help in shedding light on this topic.