1. Gather user's intent and required parameters (crypto, fiat, amount, address, network).
2. Determine the appropriate Binance Onchain-Pay API endpoint.
3. Construct the JSON body for the API request.
4. Authenticate the request by signing it using RSA SHA256.
5. Execute the API call using the `sign_and_call.sh` script.
6. Present the JSON response to the user.
7. Handle potential errors and provide informative messages.