curl --request POST \
  --url https://mainnet.gomaestro-api.org/v1/contracts/multisig/update \
  --header 'Content-Type: application/json' \
  --header 'api-key: <api-key>' \
  --data '{
  "initiator_address": "<string>",
  "new_signers_addr": [
    "<string>"
  ],
  "new_threshold": 123,
  "fund_policy_id": "<string>",
  "fund_asset_name": "<string>",
  "new_spending_limit": 123
}'

{
  "cbor_hex": "<string>",
  "tx_hash": "<string>"
}