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If you would like to authorize someone to use your documents as proof of billing, here is a sample authorization letter for proof of billing.


Date

To,

[Receiver’s Address]

Subject: Authorization for Proof of Billing

Dear [Name],

I, [Your Name], hereby authorize [Name], with whom I am holding a relationship of [Mention your relation with that person] to use my [Document name to be used] as a proof of billing. I understand and acknowledge the regulations related to this matter.

I am enclosing a copy of our valid identification cards along with the [Document name] as proof of billing.

Thanks for your sincere cooperation and assistance.

In case you have any doubt regarding this authorization letter, kindly reach me at [Email/contact number] 

Sincerely,

[Your Name]