labelIds field in POST or PUT /posts endpoints.curl --location --request POST 'https://api.swonkie.dev/v2/labels' \
--header 'X-API-ID: {{apiId}}' \
--header 'X-API-KEY: {{apiKey}}' \
--header 'Content-Type: application/json' \
--data-raw '{
"name": "Campaign Q1 2026"
}'{
"id": "TGFiZWxJZDExMTExMTEx",
"name": "Product Launch",
"color": "#777680"
}