By establishing a correspondence account in each Financial Service Provider (FSP) of a group of FSPs and a secure inter-FSP messaging mechanism, transfers of funds entirely within member FSPs (FSP 1, FSP 2, FSP 3, FSP 4) may be combined with secure messaging to effectively transfer funds between buyers in one FSP (FSP 2) and sellers in another FSP (FSP 1) without actual transfer of funds between FSP's.