Currency not supported. INVALID_CURRENCY

The request body below returns invalid currency. What currency codes work for Uganda? Tried altering the currencies but same error.{    "amount": "40000",    "currency": "UGX",    "externalId": "c1f4687688585858a173f12",    "payer": {        "partyIdType": "MSISDN",        "partyId": "25678119xxxx"    },    "payerMessage": "Payment for services",    "payeeNote": "Payment for services"}