fetchUserPlanListFromLinkFive method
Fetches the receipts for a user
if no LinkFive UUID is provided, LinkFive will generate a new user ID
Implementation
@override
Future<LinkFiveActiveProducts> fetchUserPlanListFromLinkFive() async {
final uri = _makeUri("api/v1/purchases/user");
final response = await httpClient.get(uri, headers: await _headers);
return _parseOneTimePurchaseListResponse(response);
}