Hi Kerry There was this Community post some years ago about how to access a TD-Ameritrade account use URLFetch, which has now been superseded by URLRead and URLExecute. See https://community.wolfram.com/groups/-/m/t/512676

Michael

Josh, I tried that link you posted but it says http 403, not authorized. Is that link still good?
Thx

Bart

One other note. The Tasty Works / Tasty Trade platform is owned and was/is developed by the original people from Think or Swim (Tom Sosnoff and company) which was sold to TD several years ago. They will be providing an API to the Tasty Works platform in the coming weeks which is supposed to be much more user friendly than the TD API. Additionally, since Tasty Works was developed by the same TOS development team and professional traders they knew of all the shortcoming in TOS and have worked to modernize and update every shortcoming and have made the trade execution orders of magnitude faster in Tasty Works than on TD's TOS platform. It is my understanding that since the time TD bought out TOS there has been little if any real modernization of the platform. In fact, with Charles Schwabb's purchase of TD's retail trading business there is little hope for any substantial upgrades to TOS in the immediate future. In short, Tasty Works is essentially a completely overhauled version of TOS both on the front end user interface and the back end execution technologies. I am told that Tasty Works trades are executed via a high frequency trading firm. Something to consider if you are not completely committed to TD and TOS.

https://tastyworks.com/

https://www.tastytrade.com/

Also there are several very good videos on YouTube describing detailed TD API interface wrappers developed in Python including links to Git Hub where the complete code can be downloaded. I suppose if we could simply use Mathematica to make the calls to the TD API via the provided Python code that may be a workaround.

This fellow's channel has very good information using Python:

https://youtu.be/P5YanfJFlNs

As does this channel:

https://youtu.be/qJ94sSyPGBw

Additionally TD provided the following little bit of information:

A callback URL is something you assign to your application during the application registration process. If your application is local to your computer, you can use a locally hosted callback URL like https://127.0.0.1:8080.

Josh:

Please post when you have a solution.

I skimmed through the reddit link you provided. It is good that it lead you to a solution path. However, that quick look tells me that there is something a bit convoluted (but if it works? it works!). The parts that are of concern is going to another site just to get a URL Decode or Encode.

Keep us posted

Hans