Retrieves a paginated collection of coupons with optional filtering and sorting capabilities.
Supports standard pagination parameters including page size, page number, and ordering criteria.
Returns comprehensive coupon data including status, expiration dates, usage counts, and metadata.

This endpoint provides efficient paginated access to the coupon collection with server-side filtering.
Use query parameters to control pagination: pageSize (default 20, max 100), pageNumber (1-based).
Results include total count metadata for implementing client-side pagination controls.
Supports filtering by status, expiration date ranges, and issuer identification.