curl --request POST \
  --url https://demo.onlinebillingform.com/api/v2/package/update \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form id=123 \
  --form group_id=123 \
  --form 'name=<string>' \
  --form 'description=<string>' \
  --form tax=123 \
  --form 'url=<string>' \
  --form 'trial=<string>' \
  --form 'options=<string>' \
  --form 'keep=<string>' \
  --form files='@example-file' \
  --form product_images='@example-file' \
  --form 'cycle.cycle=<string>' \
  --form 'cycle.price=<string>' \
  --form 'cycle.setup=<string>' \
  --form 'upgrade_paths=<string>' \
  --form 'cycle.id=<string>' \
  --form 'upgrade_paths.*.target_package_id=123' \
  --form 'upgrade_paths.*.sort_order=<string>'

{
  "success": true
}