It is great to have AC (Mark) in on this discussion. However, the link provided for API leads to a page that includes:

This documentation is intended to provide direction for accessing patient data from the Common Clinical Data Set using the Amazing Charts Common Clinical Data API to satisfy 2015 CEHRT Regulations § 170.315(g)(7), § 170.315(g)(8), and § 170.315(g)(9).

Click here to access the API documentation. (THIS IS MOSTLY PAGES OF CODE)

Click here to request API access. (THIS LEADS TO A BLANK PAGE)

So.... Not sure how this helps us poor little Luddites. To facilitate this conversation, may I define a few relevant inquiries:

Specifically, how does this law change more traditional medical record information exchanges, where a written request is made of a provider and the information is subsequently faxed (which in my state by law allows 15 business days to be accomplished, after any applicable medical record fee is paid, barring emergency requests from physicians which are addressed ASAP without fee).
For example:
1. If a patient requests information from their record, do they still have to fill out a medical record request (per HIPAA). Will patients be in a two class system, those using the old methods and those using the new?
2. Can a medical record fee still be charged for non-emergent requests before providing the information?
3. Do we have to join to an app that allows direct patient access to their records (to some degree) at all times?
4. Does the AC/Updox portal provide the same functionality as an app would?
5. Must patients register with provider specifically for this direct access before it it provided?
6. I receive study and lab reports in PDF format and they are stored in PDF format in AC. Can I get examples of how to provide notes and reports to patients under the new law using AC?
7. I get records and reports from other providers. Do I / can I provide access to these to patients?

While some of the above might not be in the purview of AC, the AMA recommends that we ask our EHR vendor the questions that are pertaining to access implementation via the EHR.
Well, asking done!
(But Grandma, what a big onus you have!)