curl --request POST \
  --url https://api.relay.link/withdrawals/attest-deposit \
  --header 'Content-Type: application/json' \
  --data '
{
  "chainId": 123,
  "transactionId": "<string>"
}
'

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({chainId: 123, transactionId: '<string>'})
};

fetch('https://api.relay.link/withdrawals/attest-deposit', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.relay.link/withdrawals/attest-deposit"

payload = {
    "chainId": 123,
    "transactionId": "<string>"
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)