When a client shows up, at the bottom of the screen, you'll see what they're asking for. For example, there will be 4 greyed out blunts on the screen. At the top right of the screen, you can see the type of product and number of them you have in your inventory.
To do the deal, you must tap the icon of the icon you want to sell within your inventory. For example, for 4 blunts you must tap one, two, three, four times on the blunts in your inventory. Each time you tap, your inventory will decrease. At the bottom of the screen, the blunts will change from the greyed out color to show that the order is being filled. When you have filled all the items in their order, click Sell to complete the deal.
Incomplete orders cannot be filled. Your clients in the RV have very specific tastes. If a client wants to buy more than one item, and you don’t have all of the items they are requesting, you won’t be able to complete a deal with them. You can find which items they want to buy at the bottom of the screen. On the top left of the deal screen, you can see the inventory of what you have available to sell to them. If you don’t have the items they want, you have to tell them to piss off.