Maintaining Authorization object thru ABAP code

Hi All

We want to write a function to maintain Authorization object Activity and field value for an object.

we have Authorization object already created with fields, we want to maintain values for these fields for a user.

The idea is to manage job roles 2nd level authorization from a custom application (non SAP). Kindly advise how can we write ABAP code to achieve this.

Best Regards

Sidra Hasan