Square REST API: Error issuing refund - square

Question

Every time I try to refund a card, I get the JSON pasted below. This happens after I authorize a card, then capture the charge, then want to issue a partial refund. For “tender_id” I have tried both the transaction ID and the ID I am handed during the authorization. Of course for the capture there is no tender_id or id because a successful capture returns just “{}”.
I am also using sandbox credentials. The charge was done with a nonce generated with sandbox credentials as well.
What’s wrong?
Thanks...
POST to:
https://connect.squareup.com/v2/locations/CBASEHHNorL75TjuSOAvKQLnuNYgAQ/transactions/a2905f34-c8e8-5534-7676-82e8c580e9bf/refund
With this JSON:
{
"idempotency_key":"6464dc19-1703-47c0-81f9-4f0f1361eada",
"tender_id":"291d56b3-1e73-5bff-6e8e-719fd134b83f",
"reason":”Partial refund",
"amount_money":{
"amount":4500,
"currency":"USD"
}
}
Gives this reply:
{
"errors": [
{
"category": "INVALID_REQUEST_ERROR",
"code": "NOT_FOUND",
"detail": "Location `CBASEHHNorL75TjuSOAvKQLnuNYgAQ` does not have a transaction tender with ID `291d56b3-1e73-5bff-6e8e-719fd134b83f`."
}
]
}
UPDATE: The result from the requested GET call (in the comments to the answer) is:
{
"transaction":{
"id":"a2905f34-c8e8-5534-7676-82e8c580e9bf",
"location_id":"CBASEHHNorL75TjuSOAvKQLnuNYgAQ",
"created_at":"2017-02-21T22:08:10Z",
"tenders":[
{
"id":"a18b98c7-5ac7-51c1-618c-3b95ee124c1b",
"location_id":"CBASEHHNorL75TjuSOAvKQLnuNYgAQ",
"transaction_id":"a2905f34-c8e8-5534-7676-82e8c580e9bf",
"created_at":"2017-02-21T22:08:10Z",
"note":"Online Transaction",
"amount_money":{
"amount":12500,
"currency":"USD"
},
"processing_fee_money":{
"amount":372,
"currency":"USD"
},
"type":"CARD",
"card_details":{
"status":"CAPTURED",
"card":{
"card_brand":"VISA",
"last_4":"5858"
},
"entry_method":"KEYED"
}
}
],
"reference_id":"63614ae8-539a-4339-b5c7-554bae64fbed",
"product":"EXTERNAL_API"
}
}

Answer 1

After you capture, have you tried listing/retrieving the transaction to get the full details, including tender ids? Could you post your response from GET /v2/locations/CBASEHHNorL75TjuSOAvKQLnuNYgAQ/transactions/a2905f34-c8e8-5534-7676-82e8c580e9bf if that doesn't work?