Check if requiredParams is string before passing to json_decode

[barryvdh]

Gave errors with Autopay

[2025-05-01T12:14:22.247245+00:00] main.CRITICAL: TypeError: json_decode(): Argument #1 ($json) must be of type string, null given in /data/web/magento_pl_staging/releases/28/vendor/bluepayment-plugin/module-bluepayment/Model/Gateway.php:493
Stack trace:
#0 /data/web/magento_pl_staging/releases/28/vendor/bluepayment-plugin/module-bluepayment/Model/Gateway.php(493): json_decode()
#1 /data/web/magento_pl_staging/releases/28/vendor/bluepayment-plugin/module-bluepayment/Model/CustomFieldResolver.php(31): BlueMedia\BluePayment\Model\Gateway->getRequiredParams()
#2 /data/web/magento_pl_staging/releases/28/vendor/bluepayment-plugin/module-bluepayment/Model/Payment.php(480): BlueMedia\BluePayment\Model\CustomFieldResolver->resolve()
#3 /data/web/magento_pl_staging/releases/28/vendor/bluepayment-plugin/module-bluepayment/Controller/Processing/Create.php(213): BlueMedia\BluePayment\Model\Payment->getFormRedirectFields()
#4 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/Interception/Interceptor.php(58): BlueMedia\BluePayment\Controller\Processing\Create->execute()
#5 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/Interception/Interceptor.php(138): BlueMedia\BluePayment\Controller\Processing\Create\Interceptor->___callParent()
#6 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/Interception/Interceptor.php(153): BlueMedia\BluePayment\Controller\Processing\Create\Interceptor->Magento\Framework\Interception\{closure}()
#7 /data/web/magento_pl_staging/releases/28/generated/code/BlueMedia/BluePayment/Controller/Processing/Create/Interceptor.php(23): BlueMedia\BluePayment\Controller\Processing\Create\Interceptor->___callPlugins()
#8 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/App/Action/Action.php(111): BlueMedia\BluePayment\Controller\Processing\Create\Interceptor->execute()
#9 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\App\Action\Action->dispatch()
#10 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/Interception/Interceptor.php(138): BlueMedia\BluePayment\Controller\Processing\Create\Interceptor->___callParent()
#11 /data/web/magento_pl_staging/releases/28/vendor/tinxit/b2bpricing-magento2/Plugin/App/Action/Context.php(101): BlueMedia\BluePayment\Controller\Processing\Create\Interceptor->Magento\Framework\Interception\{closure}()
#12 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/Interception/Interceptor.php(135): TinxIT\B2BPricing\Plugin\App\Action\Context->aroundDispatch()
#13 /data/web/magento_pl_staging/releases/28/app/code/Anowave/Ec/Plugin/App/Action/Context.php(148): BlueMedia\BluePayment\Controller\Processing\Create\Interceptor->Magento\Framework\Interception\{closure}()
#14 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/Interception/Interceptor.php(135): Anowave\Ec\Plugin\App\Action\Context->aroundDispatch()
#15 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/Interception/Interceptor.php(153): BlueMedia\BluePayment\Controller\Processing\Create\Interceptor->Magento\Framework\Interception\{closure}()
#16 /data/web/magento_pl_staging/releases/28/generated/code/BlueMedia/BluePayment/Controller/Processing/Create/Interceptor.php(32): BlueMedia\BluePayment\Controller\Processing\Create\Interceptor->___callPlugins()
#17 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/App/FrontController.php(245): BlueMedia\BluePayment\Controller\Processing\Create\Interceptor->dispatch()
#18 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/App/FrontController.php(212): Magento\Framework\App\FrontController->getActionResponse()
#19 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/App/FrontController.php(147): Magento\Framework\App\FrontController->processRequest()
#20 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\App\FrontController->dispatch()
#21 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\App\FrontController\Interceptor->___callParent()
#22 /data/web/magento_pl_staging/releases/28/vendor/magento/module-store/App/FrontController/Plugin/RequestPreprocessor.php(99): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception\{closure}()
#23 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/Interception/Interceptor.php(135): Magento\Store\App\FrontController\Plugin\RequestPreprocessor->aroundDispatch()
#24 /data/web/magento_pl_staging/releases/28/vendor/magento/module-page-cache/Model/App/FrontController/BuiltinPlugin.php(71): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception\{closure}()
#25 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/Interception/Interceptor.php(135): Magento\PageCache\Model\App\FrontController\BuiltinPlugin->aroundDispatch()
#26 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception\{closure}()
#27 /data/web/magento_pl_staging/releases/28/generated/code/Magento/Framework/App/FrontController/Interceptor.php(23): Magento\Framework\App\FrontController\Interceptor->___callPlugins()
#28 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/App/Http.php(116): Magento\Framework\App\FrontController\Interceptor->dispatch()
#29 /data/web/magento_pl_staging/releases/28/vendor/magento/framework/App/Bootstrap.php(264): Magento\Framework\App\Http->launch()
#30 /data/web/magento_pl_staging/releases/28/pub/index.php(30): Magento\Framework\App\Bootstrap->run()