robertman11: What is a Corporation Document?

A certificate of incorporation is a legal document relating to the formation of a company or corporation. It is a license to form a corporation issued by state government.Simply doccument givven by government for starting a business.

AlertPay is asking to scan your Corporation Document because you signed up under Business Account

nothing but a certificate of incorporation.
or a document relating to the formation of a company.

document relating to the formation of a company

You should be able to submit your Articles of Incorporation for this purpose.