Form A2 is the declaration you sign for every outbound remittance under FEMA. It records the purpose code, beneficiary details, and an undertaking that you have not breached the LRS cap. Most banks now offer a digital A2 flow.
For GIFT City product subscriptions, the beneficiary is typically the trustee or fund administrator's collection account inside the IFSC. The purpose code is usually S0001 (capital account — investment in equity) or S0003 (investment in debt).