"type": "paypal_payments",
"self": "https://yourdomain.commercelayer.io/api/paypal_payments/qaZPVIyoeg"
"return_url": "https://checkout.yourdomain.com/jNbQLhMeqo/paypal",
"cancel_url": "https://checkout.yourdomain.com/jNbQLhMeqo",
"paypal_payer_id": "aaabbbccc123",
"paypal_id": "PAYID-xxxxyyyyzzzz",
"approval_url": "https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_express-checkout&token=EC-123abc456",
"created_at": "2018-01-01T12:00:00.000Z",
"updated_at": "2018-01-01T12:00:00.000Z",
"reference_origin": null,
"self": "https://commerce-layer.commercelayer.co/api/paypal_payments/qaZPVIyoeg/relationships/order",
"related": "https://commerce-layer.commercelayer.co/api/paypal_payments/qaZPVIyoeg/order"