bad request remittance transfer

I am getting remittance transfer bad request error message. my request body is this. any wrong?
{
  "amount": "600",
  "currency": "EUR",
  "externalId": "00004335",
  "payee": {
    "partyIdType": "MSISDN",
    "partyId": "56733123450"
  },
  "payerMessage": "MoMo Market Payment",
  "payeeNote": "MoMo Market Payment"
}