No. Preserve the actual official instructions and payment records for the named case. A service invoice records a different obligation.
Keep the parties and purpose of each document clear
Identify what the provider agreed to do and which programme stage has genuinely occurred. Do not describe a private payment as proof that the gift or processing requirement has been completed.
The official process describes further USCIS instructions following the initial application, so the applicant should expect to produce the ordinary immigrant-petition evidence for whichever classification is assigned, plus whatever the program itself requests. The official process describes an application and fee, further USCIS instructions and supporting documents, vetting, and the subsequent gift once instructed, and the applicant still needs to be eligible for lawful permanent residence, admissible, and have an available visa. Identity and immigration-history records for both spouses, evidence of the lawful origin of the funds for the gift and fee, marriage and birth certificates for any dependants, and a dated copy of the official program terms. Assign responsibility for every record and deadline in writing, while ensuring the applicant retains copies of submissions, official notices, identity evidence, payment confirmations, and the employer’s reimbursement ledger. If a government notice later states a birth place or classification you believe is wrong, investigate the conflict and respond through the official channel rather than repeating information you know to be inaccurate.