How to use Gemini in Google Messages?

Hello, I'm curious about how to use Gemini in Google Messages. Can you walk me through the process step-by-step? I'm interested in learning how to set up Gemini as a payment method and start sending and receiving crypto transactions through the messaging app. I'm also wondering if there are any specific requirements or limitations to using Gemini in Google Messages that I should be aware of. Thank you for your help!