The task is deleted — now, or by an earlier call.

Your request body could not be read, so nothing was changed. error.details.reason says what the problem was.

Your bearer token is missing, or it is not valid. Get a new one from POST /api/v4/authenticate and send it again.

Your token is valid, but it does not allow this. Nothing was changed.

There is nothing here to return. Either the record does not exist, or it belongs to another company and so is not yours to see.

Nothing was deleted: the task's loan file is archived. error.code is RESOURCE_CONFLICT and the message names the loan.

Your body is JSON, but it was not labelled as JSON, so it was not read and nothing was changed. Send it again with Content-Type: application/json.

One or more of the values you sent cannot be used, so nothing was changed. error.fields names each field and says what was wrong.

You have made too many calls, so this one was refused and nothing was changed. Retry-After says how many seconds to wait; sending the same request again after that works.

Any other failure. The shape is the same as every other error reply, so the same code can read it.