`confirmation_invalid`

Status 428. The confirmation does not match this request, or has expired.

What it means

The confirmation sent in Matrix-Confirmation cannot be used. reason says why: expired (it is older than 10 minutes), wrong_request (the key, member, body or Idempotency-Key differ from the preview's) or malformed (it is not a confirmation this API issued).

What to do

Preview the request again with ?dry_run=true, then send the new confirmation with exactly the request you previewed: the same key, member, body and Idempotency-Key.

Safe to send again?

Not as it is. Change what the answer points to, then send the request.

What else the answer carries

reason: expired (preview again), wrong_request (the key, member, body or Idempotency-Key differ from the preview) or malformed (not a confirmation this API issued). With invalid_request on a webhook url: what is wrong with the address, as listed under WebhookEndpointRequest.

Where you can meet it

POST /stores/{store_key}/programme: Change the earn rate, the bonuses, what a point is worth, referrals, spending any amount, the time zone, the ways to earn, or when points expire
POST /stores/{store_key}/programme/rewards: Add a reward shoppers can spend points on
POST /stores/{store_key}/programme/rewards/{reward_id}: Change a reward's cost, value, minimum order or label
POST /stores/{store_key}/programme/rewards/{reward_id}/remove: Remove a reward
POST /stores/{store_key}/programme/offers: Add an offer: a campaign, a product offer or a channel offer
POST /stores/{store_key}/programme/offers/{offer_id}: Change an offer
POST /stores/{store_key}/programme/offers/{offer_id}/remove: Remove an offer
POST /stores/{store_key}/design: Change the design: colours, words, the panel and product-line look, the account page layout, the terms link
POST /members/{member_key}/adjustments: Add points to a member's balance, or take them away
POST /members/{member_key}/codes/void: Cancel a reward code and give the member back its points

Every code, and the shape of an error answer: Errors.