Laravel SaveJson to Database - laravel

Question

I am new to Json and API I need your help in understanding this error. I wish to save JSON Data in a database table (MpesaStkPush), all I get is an error.
I have tried changing from json_encode to json_decode.
laravel.log
[2021-02-12 19:13:41] local.ERROR: Symfony\Component\HttpFoundation\Response::setContent(): Argument #1 ($content) must be of type ?string, stdClass given
MpesaController
public function stkPush(Request $request){
$amount = $request->totalAmount;
$url ='https://sandbox.safaricom.co.ke/mpesa/stkpush/v1/processrequest';
$curl_post_data =[
'BusinessShortCode' => 174379,
'Password' => $this->lipaNaMpesaPassword(),
'Timestamp'=>Carbon::rawParse('now')->format('YmdHms'),
'TransactionType'=> 'CustomerPayBillOnline',
//'Amount' => $amount,
'Amount' => '1',
'PartyA' =>'254710909198',
'PartyB' =>174379,
'PhoneNumber'=>'254710909198',
'CallBackURL'=> 'https://375e0eb81d88.ngrok.io/api/stk/push/callback/url',
'AccountReference'=>"Wabe Digital Agency",
'TransactionDesc'=> "Lipa Na Mpesa"
];
$data_string =json_encode($curl_post_data);
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_HTTPHEADER, array('Content-Type:application/json','Authorization:Bearer '.$this->newAccessToken()));
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_POSTFIELDS, $data_string);
$curl_response = curl_exec($curl);
return json_encode($curl_response);
}
public function mpesaRes(Request $request){
$response =json_decode($request->getContent());
if (property_exists($response, property: 'Body') && $response->Body->stkCallback->ResultCode =='0'){
$merchant_request_id=$response->Body->stkCallback->MerchantRequestID;
$checkout_request_id=$response->Body->stkCallback->CheckoutRequestID;
$trn = new MpesaStkPush;
$trn =MpesaStkPush::where('merchant_request_id', $merchant_request_id)->where('checkout_request_id', $checkout_request_id)->first();
$data=[
'result_desc'=> $response->Body->stkCallback->ResultDesc,
'result_code'=> $response->Body->stkCallback->ResultCode,
'merchant_request_id' => $merchant_request_id,
'checkout_request_id' => $checkout_request_id,
'amount' => $response->Body->stkCallback->CallbackMetadata[0]->Value,
'mpesa_receipt_number'=> $response->Body->stkCallback->CallbackMetadata[1]->Value,
//'b2c_utility_account_available_funds',
'transaction_date' => $response->Body->stkCallback->CallbackMetadata[2]->Value,
'phone_number'=> $response->Body->stkCallback->CallbackMetadata[3]->Value,
];
$trn->fill($data)->save();
. K

Answer 1

Pay more attention to the logs. In your case it points that you've mismatched with types (put a class instance instead of the string)
Anyway, I advise you to read the following php function documentation:
https://www.php.net/manual/en/function.json-decode.php
The second argument is a trick: if it's set to true, you'll get an array instead of stdClass instance.
Overmore, request instance has more eloquent methods.