Hello Sir or Madam:
I have been working for last two years with several APIs(the way to get both Shopify and Intuit online data) and with Sheets, I do ETL an dintegration a lot, macros in Sheet for every thing and DS.
As you would know, it´s a better way for your task, to integrate all data in a Google Sheets, in order to use its capability to ETL any data with better performance than DS for retrieval from other source like the above noted, and then, show in DS the right graph.
I could take me from near two weeks depending on API´s connection from JS macro language , the one use Google in its Gsuite applications.
I am ready to start ASAP.
I look forward to contract me.
Sincerely yours.