We are using some open source code licensed as Apache License 2.0. From what I understand, we cannot endorse the company that made the code.
We are using it to develop an free app with micro purchases, but the code isn't actually located on the app, it's located in the cloud on our processing servers. Our app doesn't actually use any of the code, it uses our AWS servers for processing that use the code. It sends images to the AWS API then it returns them back after we have used the open source code.
Now, I understand we have to retain the license used so we plan on including it in our terms and condition page and making users accept it upon opening the app for the first time. My question is, can we mention in our app description that we are using the code?
Here is an example, can we do this or is this endorsement?
Our app uses a modified version of [original OS company ex. Twitter's] [open source package name ex. Mask API] to digitally transform the code into [whatever the code + modifications do]."