How do I make a recurring purchase on Coinbase?

I'm interested in making recurring purchases of cryptocurrency on Coinbase, but I'm not sure how to set it up. Could you please explain the process in detail? I'd like to know how to set the frequency, amount, and which currency I'd like to purchase. Additionally, are there any fees associated with recurring purchases, and is there a minimum or maximum amount I can set? I'd appreciate it if you could provide a step-by-step guide to ensure I set it up correctly. Thank you for your help in navigating this process.