For example in the attached image you can see two assignment groups that counts 50% each towards the final grade and then the total grade as calculated by Canvas. 

We would like this total grade to be integrated into our SMS. Is there an API statement that would give me the total grade for a course?

Or how could I go about getting this information. I specifically want the "Total" grade. Not the grade for assignment groups or an individual assignment. I will get the SMS team to do the rest, but I just need to know how to extract this data from Canvas. 

Thank you for your help!