curl --location '/plans//collections' \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '{
"collection_ids": [
"string"
]
}'[
{
"collection_id": "string",
"title": "string",
"added_by": {
"plan_member_id": "string",
"nickname": "string",
"picture": "string"
}
}
]