The following setup focused to create a Default payment option on the Buy menu (Now/Later Payment) menu. If your purchase transaction wants the default setup as Later, this can make it easier for you when inputting invoices, you don't need to switch Payment (Now/Later) for each transaction. For detailed setup steps you can check the following article:
I. How to Setup
Step 1. Settings - Other Menu - Module
Step 2. Module Configuration - Buy - Payment Dialog - Now / Later
II. Setup Results
If this setup has been done according to the method above, then when you make a Pay it will immediately display the Later option. So you don't need to manually change the payment from Now to Later.
You might also like to read this article:
If you want to apply the purchase method with 2 steps of verification, you can do it at DealPOS by configuring the setup, you can check the detailed explanation in this article: How to Activate Approval when using Buy (2 steps).
If you want to make a Purchase Return, you can read the article here: Purchase Return
If you just added a new outlet but can't make a purchase, it's probably that you didn't set the Enable Buy setting to Yes when you did so. You'll need to do some setup for that, and you can find a thorough explanation in the following article: How to Enable Buy Menu in New Outlets.