The sample acknowledgement letters for receipt of payment provided below can be used as format templates for official and personal purposes. To confirm receipt of any request submitted, call 602-262-6421.How to write an Acknowledgement Receipt Letter? Within 30 days you will receive an email acknowledging receipt of your claim form with additional information. Thank you for your prompt payment. I am being asked to sign the Receipt of Beneficiary BEFORE receiving the Final Distribution. Is this the proper procedure? Authorization Letter​​ Thank you for contacting PHX Customer Service. All letters of authorization are accepted online at MyPHX311. Get your questions answered about Federal Student Aid at University of Phoenix.