Add one row under the data of a Google Sheets tab: the values go in order from the first column. A value starting with = is a formula, and a date or number string is read as Sheets would type it. Sent once and never retried: Sheets does not dedupe, so a repeat adds a second row (rows.upsert dedupes).
Price: $0.00 per unit.
Maximum charge per unit: $0.00.