Retrieve loyalty card with the given member ID (i.e. voucher code).
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> 📘 Alternative endpoint
> This endpoint is an alternative to this <!-- [endpoint](OpenAPI.json/paths/~1loyalties~1{campaignId}~1members~1{memberId}/post) -->[endpoint](ref:get-member-1). The URL was re-designed to allow you to retrieve loyalty card details without having to provide the `campaignId` as a path parameter.