Integrate LMS into already developed mobile applications

We have working native ios and android application and we would like to integrate lms in our application

is there any rest apis available for that?

i just go through with the open source code for the ios and android but i want to integrate course module in my application

This is a link to API documentation. you may have to set this up/enable API configuration in Openedx instance so that you will be able to access to the courses configured on your openedx instance