API & per-document metering
Programmatic document generation is an Enterprise-only SKU with a per-document charge stacked on top of the seat subscription.
What people actually say
✕API access is Enterprise only — if you're building custom integrations you're forced into custom (sales-led) pricing on top of the seats you already bought.
Source: Alex Berman, PandaDoc pricing guide ↗✕Programmatic document generation runs around $5 per document on top of subscription — 100 API documents a month is roughly $6,000 a year in pure add-on fees.
Source: Peony, PandaDoc API costs ↗✕Starter overages are billed at $2 per document on annual and $3.50 on monthly — once you blow past the cap the per-doc model is harder to budget than a clean seat fee.
Source: PandaDoc pricing page ↗
Your document API is just your Next.js app — REST and webhooks for the same envelope store the UI talks to, no separate SKU and no per-call meter. Embed signing into your product with iframe or redirect, generate quotes from a cron job, fire webhooks on completion. Generate 50,000 documents in a month if your business needs it — the cost is your S3 line item.