Reading sub item / array

Hi there.

Thanks for setting up this git.

I have some sample code i am getting from paypal.

I would like to get the 'custom_id' variable (in: purchase_units)
I tried `custom_id = oJSON.data("purchase_units").item("custom_id")` but it was empty.
How would i access it? Is it different being within an array?

Thanks

```
{
"id": "94151283KB577953A",
"intent": "CAPTURE",
"status": "COMPLETED",
"payment_source": {
"paypal": {
"email_address": "mo@Test.com",
"account_id": "A95TCZ88AZQMU",
"account_status": "UNVERIFIED",
"name": {
"given_name": "mo",
"surname": "Test"
},
"address": {
"country_code": "IL"
}
}
},
"purchase_units": [{
"reference_id": "default",
"amount": {
"currency_code": "USD",
"value": "7.50",
"breakdown": {
"item_total": {
"currency_code": "USD",
"value": "7.50"
}
}
},
"payee": {
"email_address": "sb-vuuxy28347827@business.example.com",
"merchant_id": "C832PPP4ECVRN"
},
"description": "Demo Product",
"custom_id": "DP12345",
"soft_descriptor": "PAYPAL *TEST STORE",
"items": [{
"name": "Demo Product",
"unit_amount": {
"currency_code": "USD",
"value": "7.50"
},
"quantity": "1",
"description": "Demo Product",
"category": "DIGITAL_GOODS"
}],
"shipping": {
"name": {
"full_name": "mo Test"
},
"address": {
"address_line_1": "Arba St",
"admin_area_2": "Tel Aviv",
"country_code": "IL"
}
},
"payments": {
"captures": [{
"id": "8KS14127A2501944D",
"status": "COMPLETED",
"amount": {
"currency_code": "USD",
"value": "7.50"
},
"final_capture": true,
"seller_protection": {
"status": "ELIGIBLE",
"dispute_categories": ["ITEM_NOT_RECEIVED", "UNAUTHORIZED_TRANSACTION"]
},
"seller_receivable_breakdown": {
"gross_amount": {
"currency_code": "USD",
"value": "7.50"
},
"paypal_fee": {
"currency_code": "USD",
"value": "0.43"
},
"net_amount": {
"currency_code": "USD",
"value": "7.07"
},
"receivable_amount": {
"currency_code": "ILS",
"value": "25.09"
},
"exchange_rate": {
"source_currency": "USD",
"target_currency": "ILS",
"value": "3.5487075"
}
},
"custom_id": "DP12345",
"links": [{
"href": "https://api.sandbox.paypal.com/v2/payments/captures/8KS14127A2501944D",
"rel": "self",
"method": "GET"
}, {
"href": "https://api.sandbox.paypal.com/v2/payments/captures/8KS14127A2501944D/refund",
"rel": "refund",
"method": "POST"
}, {
"href": "https://api.sandbox.paypal.com/v2/checkout/orders/94151283KB577953A",
"rel": "up",
"method": "GET"
}],
"create_time": "2023-11-27T21:30:56Z",
"update_time": "2023-11-27T21:30:56Z"
}]
}
}],
"payer": {
"name": {
"given_name": "mo",
"surname": "Test"
},
"email_address": "mo@Test.com",
"payer_id": "A95TCZ88AZQMU",
"address": {
"country_code": "IL"
}
},
"create_time": "2023-11-27T21:30:42Z",
"update_time": "2023-11-27T21:30:56Z",
"links": [{
"href": "https://api.sandbox.paypal.com/v2/checkout/orders/94151283KB577953A",
"rel": "self",
"method": "GET"
}]
}

```