Create your JSON string like this:
$data = [
'plan_id' => $planID,
'start_time' => $startTime,
'application_context' => [
'brand_name' => 'Sleep Happy Mattress',
'locale' => 'en-US',
'shipping_preference' => 'SET_PROVIDED_ADDRESS',
'user_action' => 'SUBSCRIBE_NOW',
'payment_method' => [
'payer_selected' => 'PAYPAL',
'payee_preferred' => 'IMMEDIATE_PAYMENT_REQUIRED'
],
'return_url' => 'https://example.com/returnUrl',
'cancel_url' => 'https://example.com/cancelUrl'
],
];
Then you can check that the nesting etc is correct (please note I don't know if the above is correct, I just copied it from your question), and if youjson_encode
it you will create well-formed JSON.
$jsonEncoded = json_encode($data);
Do not specify nor include astart_time
, unless you want problems with amounts not showing in checkout.
Your problem is you did not keep quotes around the variable values, which is necessary for JSON string syntax. Observe:
\"plan_id\": \"$planID\",
Using json_encode() to construct your string from an array object would be better.
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