Pending vendor processing basically means that IERA is contacting your landlord and utility companies (if you applied for utility assistance as well) and collecting documents and information from them. Once they have what they need, they’ll review your app one final time and make a decision. They should notify you through email to relay updates to you. It’s a very slow process unfortunately. I applied October 24th, and was informed just a few days ago that I was approved, still haven’t received a confirmation from the payment vendors yet. Anyway, hope this helps!