Fetch recent conversation IDs for the authenticated shop.

Authentication: API key required

Behavior

• The route looks at conversation.date and returns records created on or after now minus the requested number of days.
• days defaults to 7 when the query parameter is missing or cannot be parsed as an integer.
• Results are ordered by date descending before the IDs are extracted.
• Only conversation IDs are returned in the final conversationIds array, not the full conversation objects.
• BigInt IDs are serialized to strings in the JSON response.

{
  "success": true,
  "shopDomain": "example.myshopify.com",
  "days": 7,
  "conversationIds": [
    "987654321012345678",
    "987654321012345677"
  ],
  "totalCount": 2
}