1. Invoice: A commercial document that itemises and records a transaction between a Supplier and Buyer, including issuance of self-billed e-Invoice to document an expense.
2. Credit Note: A credit note is issued by Suppliers to correct errors, apply discounts, or account for returns in a previously issued e-Invoice with the purpose of reducing the value of the original e-Invoice. This is used in situations where the reduction of the original e-Invoice does not involve return of monies to the Buyer;
3. Debit Note: A debit note is issued to indicate additional charges on a previously issued e-Invoice; and
4. Refund Note: A refund note e-Invoice is a document issued by a Supplier to confirm the refund of the Buyer’s payment. This is used in situations where there is a return of monies to the Buyer.
应开具的电子发票类型：
1. 发票（Invoice）
发票是一种商业文件，用于详细列出并记录供应商与买方之间的交易，包括纳税人为记录支出而开具的自开式电子发票（self-billed e-Invoice）。
贷项通知单由供应商开具，用于更正错误、给予折扣，或处理退货事项，目的是减少原始电子发票的金额。
通常适用于无需退还款项给买方的情形。
借项通知单用于在原始电子发票的基础上增加额外费用或收取附加金额。
退款通知单由供应商开具，用于确认退还买方已支付的款项。
适用于需要退还款项给买方的情况。
US 7809 
BR 2091 
CA 1303 
AU 1284 
SG 1254 
TH 1206 
JP 1124 
HK 711 
