curl --request POST \
  --url http://localhost:8080/api/knowledge-bases/add-knowledge-base-sources/{knowledgeBaseId} \
  --header 'Content-Type: multipart/form-data' \
  --header 'X-API-KEY: <api-key>' \
  --header 'X-API-SECRET: <api-key>' \
  --form 'knowledge_base_texts=<string>' \
  --form 'knowledge_base_urls=<string>' \
  --form 'knowledge_base_files=<string>' \
  --form knowledge_base_files.items='@example-file'

{
  "message": "Knowledge base sources added successfully",
  "status": "success",
  "error": null,
  "data": {
    "knowledge_base_id": "knowledge_base_abc123",
    "organization_id": "your-org-id",
    "knowledge_base_name": "Customer Support KB",
    "status": "in_progress",
    "knowledge_base_sources": [],
    "updated_at": "2024-01-02T00:00:00Z"
  }
}