Providers set their checkout message and field rules themselves — see Checkout. The same two cards also appear under Providers → (pick a provider). Custom questions are set up by kurnl only; providers ask for them.

A provider’s custom questions

Ask anything else the provider needs at signup — “How did you hear about us?”, a referral code, a preferred contact time. Answers are saved on the customer record.
1

Add a field

Under Providers → (pick a provider), in the Custom Fields card, click Add a field. Give it a label, pick a type — text, dropdown (with your options), or checkbox (yes/no) — and choose Required and Show at checkout.
Custom fields manager

Defining custom fields

2

See it on checkout

Fields marked Show at checkout appear below the built-in fields on the marketplace checkout. Required ones must be answered before payment; the answers land on the customer’s record.
A field that isn’t shown at checkout still lives on the customer record — use it for internal notes filled in later.
Custom questions appear only on the Kurnl marketplace checkout. A provider with an external store asks its own questions there.