Futures Instrument Definition Multileg Message Example

{
 "m" : "FD",
 "to" : 478000000,
 "sy" : "TESTA",
 "ut" : 1634534200,
 "ps" : "A",
 "ff" : false,
 "ed" : "20211019",
 "cS" : 100,
 "Ls" : "T",
 "pi" : "0.05",
 "l" : [
 {
  "ra" : 1,
  "sy" : "TESTB"
 },
 {
  "ra" : -2,
  "sy" : "TESTC"
 },
 {
  "ra" : -3,
  "sy" : "TESTD"
 }
 ],
 "s" : 7050
}