You can grant your Prescribed Consent through the following two methods:
Log into the ZA Bank App, tap on the profile icon on the top left corner to open the menu, then go to Settings > Open Banking Consent > Add Consent Bank.
When applying for a loan that requires uploading a bank statement, a "Grant consent" button will appear under the "Bank statement" section in the "Upload documents" page. Tap on the button to access the list of banks available for authorisation, and select your desired bank to proceed.