If your restaurant intends to sell liquor, you must obtain a liquor license, which is governed at the provincial level. Each province in South Africa has its own specific laws and requirements for liquor licensing. In Gauteng, for example, the application process involves obtaining a consent letter from the municipality, advertising the intention to apply, and lodging the application with the Gauteng Liquor Board along with numerous supporting documents, including a detailed motivation, premises description, proof of advertising, SARS clearance, and proof of lawful occupation. You will need to contact the liquor board in your specific province to understand their particular application process and requirements.