协议墨西哥大使馆认证（协议可以是中文么？）
协议一般来讲是英文的，当然也可以是中英文对照的
协议一般来讲是盖公章居多的，当然也可盖对照章 中英文的

协议如果是多页还要盖骑缝章！注意每一页都要对的上去 不能出现断章的现象！

盖好章就可以处理的。

The Agreement is authenticated by the Mexican Embassy (Can the agreement be in Chinese?)

Generally speaking, the agreement is in English, but it can also be in both Chinese and English

Generally speaking, the agreement is to stamp the official seal in the majority, of course, also can be stamped as per the Chinese and English

If the agreement is more than a page but also stamped with the seal! Pay attention to each page must be correct up not to appear chapter break phenomenon!

It can be done with the stamp.