One row per offer mapped somewhere on the channel, carrying how many of the channel's enabled listings carry it and how many there are in total. Drives a tri-state checkbox: equal counts are a full mapping, a lower count is a partial one. Offers mapped nowhere on the channel are omitted.

📄️ Attach/update a bank offer on a listing+channel

`listingId` takes one listing or an array of them, so the set picked in the listing selector is attached in one save. The response carries one mapping per listing. To attach several offers at once instead, use `/bank-offers/bulk`.

📄️ Attach and detach bank offers across a channel

Takes what a checklist save changed: `attach` fans out one mapping per enabled listing, `detach` clears an offer off the channel entirely. Offers in neither list are left alone, so a mapping made against a single listing survives a channel-level save. One transaction — either the whole set lands or none of it does.

📄️ Attach several bank offers to a listing+channel

Upserts one mapping per offer in a single transaction — either every offer in the list is attached or none is. Re-sending an offer that is already mapped is a no-op, so the whole set can safely be re-sent to reconcile. Use the singular endpoint above to attach one offer.

📄️ Bulk delete bank-offer mappings from CSV

Bulk delete bank-offer mappings from CSV

📄️ Bulk upsert bank-offer mappings from CSV

Bulk upsert bank-offer mappings from CSV

📄️ Attach/update a cancellation plan (with overrides) on a listing+channel

`listingId` takes one listing or an array of them, so the set picked in the listing selector is attached in one save. The response carries one mapping per listing.

📄️ Attach a cancellation plan to every listing on a channel

Fans the plan (with any overrides in the body) out to a listing_channel_cancellation_plan row for every enabled listing on the channel — the table the cart/offer cache reads. The body's `listingId` is ignored. Point-in-time: listings added later aren't auto-enrolled. Returns the number of listings written.

📄️ Bulk delete cancellation-plan mappings from CSV

Bulk delete cancellation-plan mappings from CSV

📄️ Bulk upsert cancellation-plan mappings from CSV

Bulk upsert cancellation-plan mappings from CSV

📄️ Attach/update a coupon on a listing+channel

`listingId` takes one listing or an array of them, so the set picked in the listing selector is attached in one save. The response carries one mapping per listing.

📄️ Attach a coupon to every listing on a channel

Attach a coupon to every listing on a channel

📄️ Bulk delete coupon mappings from CSV

Bulk delete coupon mappings from CSV

📄️ Bulk upsert coupon mappings from CSV

Bulk upsert coupon mappings from CSV

📄️ Attach/update a promotion on a listing+channel

`listingId` takes one listing or an array of them, so the set picked in the listing selector is attached in one save. The response carries one mapping per listing.