How can I load lots of data at a time with Aidbox API?

You can use Bulk API for that

How to increase speed/performance for requests with complex parameters?

Create indexes for that

Does Aidbox support 2-factor authentication?

Yes, please, check out the documentation​

How to create a SearchParameter for extensions on a property in a resource?

You can create custom search parameter for extensions and to made SearchParameter easier to write you also can define attribute​

I’m building a request with revinclude. Is it possible to also apply a search for the include resource in that request?

In the FHIR Search API this is called chained-parameters. Read the details here and here​

Aidbox appears to have a POST size limit of 20 MB by default. Is this configurable?

For sizable data, we recommend using Bulk API​

I don't want to use BASIC authentication for security reasons. What can I use instead?

We suggest OAuth implementation in Client Credentials Grant. You need to use “Client Credentials Grant + Access Policy”:

• Create a Client and teach the external system to receive token.

• Create an appropriate access policy​

My search doesn’t work with the full link to the resource included. Why is that?

An example of the query that doesn't work:

GET /DocumentReference?patient=https://my.aidbox.app/Patient/1234​

It’s called an absolute reference. Aidbox doesn't work with absolute references because the logic can become very tricky since these references can point to external servers.

Use relative references instead: GET /DocumentReference?patient=Patient/1234

Is there a Python fhirpath implementation to create and execute data requests with Python dicts?

Yes, please check out here​