creating some functions that do API-Calls.

I need help with the following tasks:

Take my project and push it into github for development purposes

Create the following functions that will do API Calls:

function to get all business partners through api call.
This is an initial api call that shouldbe done only once at a specific event.
Challenge: amount of business partners can be unlimite. There is a skipping function to only get X amount of skipped datasets
API Endpoint /BusinessPartners

function to get only updated business partners after something changed in the business partner dataset
API Endpoint: /BusinessPartners$filter=updated_date (this needs to be double checke)

function to get all open quotations through api call
Either: Get All Quotations from the last 3 Months
Get all quotations from the last 3 months that total doc amount is bigger than X
Get all quotations where the total doc amount is bigger than x

Endpoint: SalesQuotations

Create a function that is similiar to a cronjob and executes all 15, 30, 60 minutes / 2, 4,8 hours / 1 days
This function should be used to execute all of the above functions
Documentation for the REST-API is available