The actual official payment record matters; a private invoice may only document a charge by the service provider.
Reconcile recipient and purpose
Keep the account and case references with the payment evidence. Resolve uncertainty through the appropriate official channel rather than treating a bundled receipt as proof of every government transaction.
Gather identity and family information, a clear statement of the specific proposal under consideration, and questions about eligibility, the source of funds, and the current official instructions, then follow the government's directions for any subsequent forms. A dated copy of the official program description, any material an intermediary has supplied, and the documents describing your own qualifications and your company's position — the material an employment-based category would be assessed on. 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per-person breakdown for the household, and a statement of what happens to any payment if the application is refused or withdrawn. The first should preserve the version of instructions, payment direction and terms consulted; the second should contain passports, civil records, vetting material and classification evidence. 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.