Assign links to group

curl -X POST https://api.ofmelite.io/v1/groups/8f3e2a1b-4c5d-6e7f-8091-a2b3c4d5e6f7/links \
  -H "Authorization: Bearer ofm_YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"add":["4a23c6ba-c701-4502-b854-b1131e91e37a","b2c3d4e5-f6a7-8901-bcde-f1234567890a"],"remove":["c3d4e5f6-a7b8-9012-cdef-1234567890ab"]}'

{
  "id": "8f3e2a1b-4c5d-6e7f-8091-a2b3c4d5e6f7",
  "name": "Summer Campaign 2026",
  "linkCount": 2
}