为什么微信不能付款？这个问题可能涉及多种原因，以下是对这些原因的解析以及英文翻译对照：

首先，微信支付的账户可能没有绑定银行卡或没有足够的余额。微信支付需要绑定银行卡才能进行支付，如果账户没有绑定银行卡或者余额不足，则无法进行支付。英文翻译为：Firstly, the WeChat payment account may not be linked to a bank card or have insufficient balance. WeChat payment requires linking a bank card to make payments, if the account is not linked to a bank card or has insufficient balance, payments cannot be made.

其次，微信支付的账户可能存在安全问题。如果账户存在异常操作、密码错误等情况，系统为了保护账户安全，可能会暂时冻结支付功能。英文翻译为：Secondly, the WeChat payment account may have security issues. If there are abnormal operations or password errors, the system may temporarily freeze the payment function to protect the account security.

此外，商家可能不支持微信支付。虽然微信支付已经覆盖了很多商家，但是在某些地区或者行业，商家可能不支持微信支付。英文翻译为：In addition, merchants may not support WeChat payment. Although WeChat payment has covered many merchants, in some regions or industries, merchants may not support WeChat payment.

最后，微信支付账户可能存在违规行为。如果账户被检测到涉及违规操作，例如虚假交易、洗钱等行为，系统会限制支付功能，严重情况下可能会封禁账户。英文翻译为：Finally, the WeChat payment account may have违规行为. If the account is detected to involve违规操作, such as false transactions or money laundering, the system may restrict payment functions, and in severe cases, the account may be banned.