if checkAccountparamgetAccount throw new BizException邮箱已存在; if paramgetThirdId == null paramsetThirdId1L; if verifyUserNumberuserDetailgetShopId

This code block checks if the given email account already exists in the system. If it does, a "BizException" is thrown with the message "邮箱已存在" (email already exists).

It also sets a default value for the "thirdId" parameter if it is null (1L in this case).

Finally, it verifies if the user has reached the maximum allowed number of email accounts (based on their shopId). If this is the case, a "WarnException" is thrown with the message "邮箱数量已经达到上限,如有需要请扩容" (maximum number of email accounts has been reached, please expand if necessary).