Wait ..! do not say "in Islam" for a matter that contains
Fiqh diversity. The nikah process that written in that blog is follow Hanafi Fiqh in Pakistani society. In Indonesia, where the Muslims are not Hanafi, the nikah process is different.
When I did nikah, I sat behind a small square desk. Beside me was my bride. In front of me were the Imam and my bride wali. At left and right, were two witnesses.
Process started with du'a by the Imam. Then my bride wali held my hand and said
"My son (my name), I make you marry my daughter (my bride name) with mahr ..."
I replied with "I accept this nikah with mahr ..... paid in cash"
Then Imam looked at the witnesses and asked them "Is the nikah valid?"
The witnesses replied with "Valid!"
Then Imam recite du'a again and gave short lecture.
My bride didn't say anything because she's not allowed to say anything.
Next process was sign the nikah certificate, that issued by Sharia institution, that contains groom and bride personal data, when and where the nikah happened, who are the Imam and witnesses. Nothing more
About agreement between husband and wife like, when they will stay, etc, cannot included in nikah certificate and should made out of nikah process.