How to distribute JSON requests to backends?

Question

JSON

Good day to all!
Try to decipher the question more broadly.
JSON RPC requests come from users in the form:
{
"jsonrpc": "2.0",
"method": "abc.new",
"id": 423,
"params": {
"card": {
"pan": "9342309420 ",
"expiry": "4234"
}
}
}
and, depending on incoming requests, they need to be spun into backends.
What tool and how can this be achieved?
Thanks for the reply in advance