No. The US$15,000 processing fee is paid to DHS for the principal and is expressly non-refundable; a representative's retainer is a separate professional charge with its own terms. Ask for a written quote covering scope and disbursements, and treat visa, medical and other government charges as further amounts on top.
Mapping who is paid, for what, and when
Write out three columns: government charges, the qualifying gift, and professional fees. In this hypothetical the principal pays US$15,000 at application and, after successful vetting, is instructed to make the US$1,000,000 gift; a joining spouse adds US$15,000 plus a US$1,000,000 gift, as does each qualifying child. These stages are separate — a combined household total is not an automatic single wire instruction. Only the US$15,000 is stated as non-refundable.
The official framework describes a gift to the U.S. government together with a processing fee. Corporate terms include 1% annual and 5% transfer charges with additional conditions and new vetting where applicable. The processing fees are spent whatever the outcome, so the household should be comfortable treating forty-five thousand United States dollars as gone before knowing anything. Verify current official instructions before payment and separate private services.
Anyone describing the arrangement as a government grant, a bond, or a refundable deposit has misunderstood it or is misrepresenting it, and both are reasons to slow down.