Retain the actual official instructions and identify the purpose and payee. A private estimate is not the same as an official request.
Check the source of the amount
Do not infer that every invoice item is a government fee simply because the case concerns immigration.
The official program instructions current on that date, written identification of who receives each payment and under what conditions, a per-person breakdown for the household, and a statement of what happens to any payment if the application is refused or withdrawn. Identity and relationship documents for each person, evidence supporting the EB-1 or EB-2 category, proof of the source of the gift funds, and a dated copy of the official terms the family relied on. Rather than filing an incomplete set and promising to supplement it, assemble the civil records first, in the format the official instructions require, with certified translations where they are needed. Keep dated copies of submitted material, requests for additional information, payment instructions, and receipts, and reassess household plans if a fact changes. The public FAQ does not publish a fixed degree, licence or source-of-funds document list, so the current portal instructions govern and the gift should be sent only when requested after vetting.