Define this parameter in the Http Request Header
{
"OrderNumber": 1,
"ReturnRequestItems": [
{
"OrderLineNumber": 64,
"ReturnQty": 2,
"ReturnReason": "sample string 3",
"ReturnDescription": "sample string 4"
},
{
"OrderLineNumber": 64,
"ReturnQty": 2,
"ReturnReason": "sample string 3",
"ReturnDescription": "sample string 4"
}
]
}