The Yelp Partner Fulfillment API allows partners to verify if a specified business is currently available to fulfill an order. Partners must implement on their servers the ability to provide real-time fulfillment availability checks for their services. This step in the checkout flow is a prerequisite before Yelp allows the user to build an order. The API provides an endpoint for postCheck Availability and requires that you connect utilizing HTTPS. Yelp Partner API endpoints allow partners to retrieve information about their businesses. Yelp is a business directory service and crowd-sourced review forum that publish crowd-sourced reviews about businesses as well as develops, hosts and markets Yelp.com.