problems with JSON-structure: check basenode-param

I would like to get som data from Planyo https://www.planyo.com but getting an error message when I try to use the following shortcode:

[jsoncontentimporter url=”https://www.planyo.com/rest/?site_id=32828&coupon_code=&email=emailaddress&method=list_coupons” numberofdisplayeditems=”30″ basenode=”data”]

• {id} {email} {type} {amount_left} {/subloop}<hr>

[/jsoncontentimporter]

This the proper JSON output from Planyo:
{
“data”: {
“results”: [
{
“id”: “15507”,
“resource_id”: null,
“email”: “emailaddress”,
“type”: “4”,
“amount_left”: “365”,
“is_personal”: “1”,
“personal_usage”: “1”,
“coupon_code”: null,
“purchase_date”: “2017-10-19 12:30:30”,
“entry_per_person”: null,
“validity_start_date”: “2017-12-06”,
“validity_end_date”: “2018-12-06”
}
]
},
“response_code”: 0,
“response_message”: “Method list_coupons executed successfully.”
}

The page I need help with: [log in to see the link]