The phrase "to support the transaction" means to help, assist, or provide necessary aid for the process or deal that is being carried out. Full definition
The company is still working on the system, and may well launch an automated escrow service that only supports transactions between crypto currencies to begin with. (coindesk.com)
The corporate team supports transactions and other activity worth hundreds of millions of pounds every year. (stronachs.com)
Such exploits remind us there are cracks in the thin, brilliant white walls of value and authenticity supporting transactions, both monetary and social, in the art world. (morganquaintance.com)