A JSON object containing a PHP variable

I'm trying to integrate a PHP variable into my PayPal single payout call code where the price is defined at 'value':".$planPrice." When I manually input a number like "1000", it works fine and I receive the notification. However, when I use the PHP variable, I encounter this error message:

Fatal error: Uncaught exception 'InvalidArgumentException' with message 'Invalid JSON String' in C:\xampp\htdocs\website\paypal_payouts\PayPal-PHP-SDK\paypal\rest-api-sdk-php\lib\PayPal\Validation\JsonValidator.php:29 Stack trace: #0 C:\xampp\htdocs\website\paypal_payouts\PayPal-PHP-SDK\paypal\rest-api-sdk-php\lib\PayPal\Common\PayPalModel.php(50): PayPal\Validation\JsonValidator::validate('{\r\n ...') #1 C:\xampp\htdocs\website\paypal_payouts\CreateSinglePayout.php(67): PayPal\Common\PayPalModel->__construct('{\r\n ...') #2 C:\xampp\htdocs\website\admin\reports\paynow.php(19): include('C:\xampp\htdocs...') #3 {main} thrown in C:\xampp\htdocs\website\paypal_payouts\PayPal-PHP-SDK\paypal\rest-api-sdk-php\lib\PayPal\Validation\JsonValidator.php on line 29

Here is the PHP code snippet: 

$senderItem = new \PayPal\Api\PayoutItem();
$senderItem->setRecipientType('Email')
    ->setNote('Thanks for your patronage!')
    ->setReceiver($coachUsername)
    ->setSenderItemId("2014031400023")
    ->setAmount(new \PayPal\Api\Currency("{
                        'value':".$planPrice.",
                        'currency':'USD'
                    }"));
phpjsonpaypal

Answer №1

Instead of passing a JSON string to Paypal\Api\Currency, it is recommended to use an array for simplicity:

$senderItem = new \PayPal\Api\PayoutItem();
$senderItem->setRecipientType('Email')
    ->setNote('Thanks for your patronage!')
    ->setReceiver($coachUsername)
    ->setSenderItemId("2014031400023")
    ->setAmount(new \PayPal\Api\Currency([
                        'value' => $planPrice,
                        'currency' => 'USD'
                    ]));

However, if JSON must be used, ensure that it is valid. JSON specifically requires the use of double quotes for strings and key names:

$senderItem = new \PayPal\Api\PayoutItem();
$senderItem->setRecipientType('Email')
    ->setNote('Thanks for your patronage!')
    ->setReceiver($coachUsername)
    ->setSenderItemId("2014031400023")
    ->setAmount(new \PayPal\Api\Currency('{
                        "value":'.$planPrice.',
                        "currency":"USD"
                    }'));

(Assuming that "value" should be assigned a JSON number. If it needs to be a JSON string, replace the third-to-last line with "value": "' . $planPrice . '", instead.)

Answer №2

It is strongly advised to avoid manually generating JSON.

Instead, utilize the PHP function json_encode(). This function handles quotes, commas, matching parentheses, and more:

$senderItem = new \PayPal\Api\PayoutItem();
$senderItem->setRecipientType('Email')
    ->setNote('Thanks for your patronage!')
    ->setReceiver($coachUsername)
    ->setSenderItemId("2014031400023")
    ->setAmount(
        new \PayPal\Api\Currency(
            json_encode(array(
                'value'    => $planPrice,
                'currency' => 'USD',
            ))
        )
    );

Additionally, there is no need to manually generate JSON. You can create a new PayPal\Api\Currency object and use its methods like setValue() and setCurrency() to set its properties.

$amount = new \PayPal\Api\Currency();
$amount->setValue($planPrice);
$amount->setCurrency('USD');

$senderItem = new \PayPal\Api\PayoutItem();
$senderItem->setRecipientType('Email')
    ->setNote('Thanks for your patronage!')
    ->setReceiver($coachUsername)
    ->setSenderItemId("2014031400023")
    ->setAmount($amount)
;

If you are unfamiliar with the PayPal API, it is common practice to construct objects using the response received from the server. Therefore, it's recommended to instantiate empty objects and then set their properties (similar to how you handle $senderItem) when constructing a request.

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