One call at the start of a sync that answers three questions at once: which indexes the account has, where this phone's index is, and what the plan allows and has used.
01 · The call
POST https://opensolr.com/solr_manager/api/photos_sync_infoA form with email, api_key, core_name (this phone's index) and signature, an HMAC-SHA256 of the index name and the email, keyed with the API key.
It runs at the start of a sync. A sync that comes right after a full check of the index, within a day, skips it and goes straight to the work.
02 · The answer
{"status": true, "index_list": […], "core_info": {…}, "account_summary": {…}}
index_list: the same as get_index_list.core_info: the index address and its credentials, the same as get_core_info.account_summary: the plan limits and usage, the same as get_account_summary, present only when the signature is right.
When this call cannot answer, the app falls back to the separate calls. Nothing is concluded from a failed call: no index is created and nothing is removed.