What is pixiv Sketch LIVE?

What are pixiv Points?

• Can I check my purchase history and Points balance?

Regarding the issuing of qualifying invoices

• What is the qualified invoicing system (QIS)?
• What kind of qualifying invoices can be issued on pixiv Sketch LIVE?
• Where can I issue Shoutout qualifying invoices?
• Where can I issue Reward transfer fee qualifying invoices?
• I left pixiv Sketch, but can I still issue qualifying invoices?