Time-series metrics

Fetch time-series data for one or more metrics over a date range. Returns daily/weekly/monthly data points for charting trends. Available metrics: gmv (affiliate-attributed), total_gmv (full shop from the Seller Center scrape), live_gmv (creator LIVE-attributed, from live_sessions — see POST /lives/* for the per-shop currency-aware view), sc_affiliate_live_gmv (creator LIVE GMV as Seller Center itself reports it, under By order source → Creator → Lives — order-date attributed, so it does not match live_gmv; use it to reconcile against a Seller Center export), creators, videos_posted, video_views, gmv_per_video, gmv_per_sample, creators_reached, creators_messaged, tc_invites_sent, samples_approved, sample_requests, gmv_driving_videos, new_creators_posting, open_collabs, accepted_tc_count, emails_sent, dm_responses, reply_rate. Seller Center whole-shop cards: orders, units_sold, aov, ctr, conversion_rate (aov/ctr/conversion_rate are ratios computed over the full window, not averages of daily ratios; 0 for shops not yet on the Seller Center sync). Granularity (day/week/month) is auto-detected based on the date range if not specified. IMPORTANT: 'creators' returns distinct creators PER DAY — summing daily values double-counts creators active on multiple days. For the headline distinct count over the full period, use POST /metrics/summary instead. Similarly, gmv_per_video and gmv_per_sample are daily ratios — use /metrics/summary for the period-level headline values. Dates default to the newest day with settled data for the shop (typically yesterday; up to 2 days back while a day finalizes).