#2  The LISTINGS APP

The Cat Directory. This is the massive heart of kittylistings.net. It handles the actual classified ads database and the visual display blocks. The cataalog database tables (Breed, Price, Description, age, location, and the "imagefield" for those cat photos
A "ListView" to show grid pages of avaialbe kittens. A detailview for when a user clicks on a single kitten to see its full profle, contact info, and graphics. 
A "createView" conatinaing a secure form so verified breeders can upload a new cat. 
This is the heavy lifter for the actual database entries, handling the cat profiles, age, pricing, and photo uploads

Dedicated entirely to the breed and state filters. The hallmark of old puppyfind style was its dead-simple, highly functional search filters right on the homepage. 
It handles processing search inquiries. it takes the user's dropdown slections (eg. filtering by state - texas. Breed = maine coon. Price = under $1000) and runs an optimized database query to instantly filter the "listings app' data. 
Keeping your search logic in its own app ensures your main listisnts page doesn't get cluttered with heavy filtering code, keeping the page speeds blzing fast.
 

#3  The SEARCH APP

The gatekeeper that links to Stripe to ensure breeders pay their subscption before posting.
My business model utilizes a subscription paywall, we need a dedicated app to handle the money safely without slowing down the rest of the site.
It Generates the secure checkout links that redirect users to stripe, and hosting the invisible "webhook" listener that waits for Stripe to say, "Payment successful! Go ahead and activate their account"
 

#4  The PAYMENTS APP