You can buy wine online and issue catering invoices, but you need to comply with the relevant tax regulations and requirements. According to the provisions of the Value Added Tax Law of the People's Republic of China*** and the State of China, the following conditions need to be fulfilled for purchasing alcohol and issuing catering invoices:

1. The purchase of alcohol is made with the purpose of carrying out catering services and not for personal consumption or other non-catering purposes.

2. You are the provider of the catering service and have the appropriate business qualifications and documentation.

3. The amount of alcohol purchased is within the legal invoicing range, generally $500 and above.

4. The online store or e-commerce platform from which the liquor is purchased is qualified and able to provide qualified VAT general invoices.

So, to buy wine online and issue catering invoices, you need to make sure that the above conditions are met, and at the same time, communicate with the online store or e-commerce platform where you bought the wine to confirm the compliance of the invoices. Specific methods and requirements may vary by region and platform, and it is recommended to consult with the relevant tax authorities or tax professionals to ensure compliant invoicing.