CyberSource card number encryption (RSA-OAEP-256)

Is there anyone know here how do I encrypt card number in cybersource?

i tried to encrypt mine using online RSAOAEP encryption tool but i got this response

{
    "responseStatus": {
        "status": 400,
        "reason": "DECRYPTION_ERROR",
        "message": "Cannot decrypt PAN (RsaOaep256): data hash wrong",
        "correlationId": null,
        "details": [],
        "_embedded": {}
    },
    "_links": {
        "self": null,
        "documentation": [],
        "next": []
    }
}

there documentation seems not enough for newbie like me