Thank you for reaching out and posting this question!
The Affirm pay-over-time messaging app isn’t like other messaging apps that allows you to chat with customers live on your store. However, if your store offers Affirm monthly payments, then this app can help you convert more shoppers by displaying their branding and allowing you to set a monthly payment price for each item.
That being said, if you’re looking for a messaging app that allows you to chat with customers live on your store, then I’d recommend taking a look at Shopify Inbox or one of these third-party chat apps. If you need any help with a third-party app, the app developer is always available to assist you - you can reach out to them directly through the contact information found in the Support section of their app’s page.
Just to confirm, are you using Affirm monthly payments or Shop Pay on your store at the moment? Or, are you looking for a live chat/messaging app for your store?