curl --request POST \
  --url https://api.gelato.digital/relays/v2/call-with-sync-fee-erc2771 \
  --header 'Content-Type: application/json' \
  --data '{
  "chainId": 123,
  "target": "<string>",
  "data": "<string>",
  "user": "<string>",
  "userNonce": 123,
  "userDeadline": 123,
  "userSignature": "<string>",
  "feeToken": "<string>",
  "isRelayContext": true,
  "gasLimit": "<string>",
  "retries": 123
}'

{
  "taskId": "<string>"
}