curl --request POST \
  --url https://tars.loopscale.com/v1/markets/creditbook/repay_simple \
  --header 'Content-Type: application/json' \
  --header 'payer: <payer>' \
  --data '
{
  "loan": "<string>",
  "repayParams": {
    "amount": 123,
    "ledgerIndex": 123,
    "repayAll": true
  },
  "strategy": "<string>",
  "weightMatrixUpdates": [
    {
      "weightMatrixUpdate": [
        123
      ],
      "collateralIndex": 123
    }
  ],
  "isLoop": true
}
'

{
  "transactions": [
    {
      "message": "<string>",
      "signatures": [
        {
          "publicKey": "<string>",
          "signature": "<string>"
        }
      ]
    }
  ],
  "expectedLoanInfo": {
    "loan": {
      "address": "<string>"
    }
  }
}