API roistat.com

We have an urgent, but not the most difficult task, for which we are willing to pay relatively generously. We need to pull data from the roystat on the request of the api for visits. Prescribed the code 3 months ago, for some reason now loaded only the first dates of the initial download (March 12-17) and 2 days of current dates (July 11, 12).
Perhaps the string constraint is related, I dont know how to get around, maybe on the base to deploy. In any case, if you are ready to take it right now, I will be grateful.

API roistat.com