Create an allowance

curl --request POST \
  --url https://api.openformat.tech/v1/credit/approve \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <api-key>' \
  --data '{
  "chain": "arbitrum-sepolia",
  "token_id": "0xd1f09c70f6f2838a3ab6209c1465af68594667ec",
  "holder_address": "0xcf7ed3acca5a467e9e704c703e8d87f634fb0fc9",
  "spender_address": "0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266",
  "amount": 123
}'

{
  "success": true,
  "unsignedTransaction": {
    "to": "0x014b680bed2433b1861239cf812dbe660fe339f2",
    "data": "0x609512c90000000000000000000000009574e9ba92cb0966c9d2ff1a9ab9e11949b9b873000000000000000000000000f39fd6e51aad88f6f4ce6ab8827279cfffb922660000000000000000000000000000000000000000000000000de0b6b3a7640000647261676f6e5f736c6179656400000000000000000000000000000000000000414354494f4e000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000c00000000000000000000000000000000000000000000000000000000000000000",
    "maxPriorityFeePerGas": "1020840008",
    "maxFeePerGas": "1035102698",
    "gas": "476358",
    "gasLimit": "476358",
    "nonce": 36,
    "chainId": 31337,
    "type": 2
  }
}