Post the latest Gusto payroll summary to Slack every Friday

Every Friday at 4pm, look at the most recent processed Gusto payroll and post a plain-English summary to a Slack channel for the leadership team. Trigger this on a cron schedule; Gusto is not a poll provider, so scheduled runs are the right entry point.

Use gusto.List Payrolls with processed=true and a check_date filter (bounded to the last few weeks) to pull the two most recent processed runs — the latest one and the one immediately before it, so week-over-week deltas are against a real prior period. If nothing new has been processed since the last digest, send a short note that says so instead of re-reporting the same numbers.

For each of those two runs, call gusto.Get Payroll to fetch full totals plus per-employee compensations. Important: Gusto returns money and hours as decimal strings, not numbers, so parse them with a decimal-safe helper — never parseFloat, which loses precision on cents.

Compute and include in the digest: gross pay, net pay, employer taxes, headcount, whether the run was off-cycle, and week-over-week deltas versus the prior period. Keep the tone concise and readable, and highlight anything notable in punchy callouts — for example, "Engineering headcount +2, gross pay +$14k" or "Off-cycle bonus run, $23k gross". Flag notable jumps so leaders can react without opening Gusto.

Post the digest with slackbot.Send a Message to the leadership channel the user chooses at setup. Slack's native Gusto integration only pushes onboarding events, not payroll summaries — that is exactly the gap this workflow fills, so founders and finance see the numbers without logging in to Gusto.