Thanks for your inquiry and interest in Visa Direct APIs. Yes, what you are seeing is correct. There are monthly updates on the Visa Developer portal so please continue to take a look around the website. I do not have an API change log readily available for you but the Visa Direct API documentation is public so please do take a look at its updates to see what has changed. Most of the information remains the same with some updates and/or releases that may be added on a monthly basis.
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As developers we have better things to do than to be reading through the entire documentation from start to finish in order to keep track as to what has changed and figure out why things have changed.
An API change log that we can RSS feed into would greatly reduce this work on our end.
Next, the API documentation is currently lying. How can attributes that previously were marked as `conditional` be now marked as `optional`? In some cases those attributes were optional and in some cases those same attributes were required, so how can such attributes be classified as `optional`?