How do I buy coins from OKX wallet?

Could you please elaborate on the steps involved in purchasing coins through the OKX wallet? I'm particularly interested in understanding the initial setup process, including any necessary verifications or security measures. Additionally, I would like to know about the various payment methods accepted by OKX and if there are any associated fees or limits. Finally, could you provide any insights on the safety and reliability of the OKX platform? I'm seeking a clear and concise explanation to guide me through this process. Thank you for your assistance.