Changing Promotion Product Using Api

I want to create a 'Deal of the Day' promotion and have the product it relates to (on the bonus tab) updated automatically. There doesn't seem to be an API call to do this, is there another way?

I am afraid CS-Cart API does not support such an ability at the moment. Additional code modifications are required

Is that something you can do?

Yes, we can create this modification for you. Feel free to contact us