Replace 'xxxxxx' with your opsman password.
{
"credential": {
"type": "rsa_pkey_credentials",
"value": {
"private_key_pem": "-----BEGIN RSA PRIVATE KEY-----xxxxxxx-----END RSA PRIVATE KEY-----\n",
"public_key_pem": "-----BEGIN PUBLIC KEY-----xxxxxxx-----END PUBLIC KEY-----\n"
}
}
}