According to the official customer service reply of Alipay, the old stickers can be used continuously after purchasing new stickers, and will not be invalid because of purchasing new stickers. Although the old stickers can continue to be used, it should be noted that each posted paper has a certain period of validity, and it will not be used after it expires.

Different stickers have different usage rules and restrictions. For example, some stickers can only be used in a specific business or a specific time period. It is recommended to read the instructions and rules of the sticker carefully before use to avoid unnecessary trouble.