Update API code on Wix Site

Hello, We had a developer put a custom API on our wix sites which link to our scheduling database to show upcoming services (like a calendar). We want a few more things fixed/updated and the developer stopped responding - so looking for someone to take over this small project. Basically we want to include the following changes: 1) Currently the API is loading all of the scheduled events (there could be hundreds...) we want to create pagnation to limit the view of upcoming schedules to show only the next 4 events on each pagnation. 2) Create a pre-loader for each page to make sure everything loads before the viewer sees. Currently YouTube is loading last... and it makes the site look strange.