curl --request POST \
--url https://api.meetcampfire.com/coa/api/entity/{entity_id}/attachment \
--header 'Authorization: <api-key>'Upload invoice email attachment with proper permissions
curl --request POST \
--url https://api.meetcampfire.com/coa/api/entity/{entity_id}/attachment \
--header 'Authorization: <api-key>'Documentation Index
Fetch the complete documentation index at: https://docs.campfire.ai/llms.txt
Use this file to discover all available pages before exploring further.