curl --request POST \
  --url https://backend.swap.coffee/v1/partnership/{address}/settings \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --data '
{
  "ref_share": 123,
  "custom_fee": {
    "fixed_fee": "<string>",
    "percentage_fee": 123,
    "min_percentage_fee_fixed": "<string>",
    "max_percentage_fee_fixed": "<string>"
  }
}
'

{
  "error": "<string>"
}