Started from 12.2, Mingle no long supports parameter "page=all" in card API.
When the project contains a large number of cards, calling cards.xml?page=all can easily slow down your Mingle instance. To avoid negative impact on Mingle performance, we made changes to the card API, if you request all cards by using cards.xml?page=all, mingle will only return first 25 cards.
Other usage of page parameter in Mingle Card API would not be affected. For example, cards.xml?page=1 will work as normal. You can find more about Mingle Card API in our help.