Missing attribute payment_processor_id of entity Contribution in API Explorer v3?

Question

I created a PHP 7 script that uses an API Call to get some information about a specific Contribution with a $contributionID that has been defined before. The code (below) works and correctly returns payment_processor_id. BUT I cannot reproduce this in CiviCRM API Explorer v3.

My code is:

 $result2 = civicrm_api3('Contribution', 'get', [
            'sequential' => "1",
            'return' => ["payment_processor","instrument_id","payment_instrument_id","payment_processor_id"],
            'id' => $contributionID,
        ]);
        $payment_instrument_id = $result2["values"]["0"]["payment_instrument_id"];
        $payment_processor_id = $result2["values"]["0"]["payment_processor_id"];
        echo "instrument ID: ";
        var_dump($payment_instrument_id);
        echo "processor ID: ";
        var_dump($payment_processor_id);

where the resulting array does correctly contain a value for payment_instrument_id. When I try to reproduce this in API Explorer v3, I get an array response with the following structure:

    {
    "is_error": 0,
    "version": 3,
    "count": 1,
    "id": 885,
    "values": [
        {
            "contact_id": "2700",
            "contribution_id": "885",
            "payment_instrument_id": "8",
            "payment_instrument": "Lastschrift",
            "instrument_id": "8",
            "id": "885"
        }
    ]
}

Obviously, there is no payment_processor_id here. So it is a big puzzle for me how the PHP API call can access an attribute that is not even there.

I entered the following values in API Explorer:

You can see that the PHP code the API Explorer produces is exactly the same as I am using in the script. Does anybody have any idea why this difference occurs?

EDIT: If @Pradeep's answer is correct, wouldn't it be logical to add this 'check_permissions' => TRUE parameter in the PHP section of API Explorer? From my perspective, the code snippets in API Explorer should represent as exactly as possible the code that is actually executed.

Answer 1

From api explorer the results are retrieved using rest api where check_permissions is always set to TRUE by default even though its been explicitly set via api params.

If you have check_permissions set to TRUE than api returns only those fields which are defined for the the entity. In your case the fields would be

civicrm_api('Contribution', 'getfields', ['version' => 3, 'action' => 'get']);

Try adding 'check_permissions' => TRUE as a api parameter in your php code, it should return exact same results you get in api explorer.

HTH

Pradeep