Paypal API Refund Payment (PHP API) - php

Question

this is my first time posting:
I wish to integrate PayPal API into my site, I can get the payment successfully done but not the refund part. I see an refund api in the lib folder; however, I am not sure which ID to use, I don't see a lot of examples regarding refund.
This is what I have now:
$refund = new Refund();
$refund->setId($payment_id);
$refund->setAmount(1000);
$refund->get($payment_id, $this->apiContext);
try {
//$refund = Refund::get();
} catch (Exception $ex) {
// NOTE: PLEASE DO NOT USE RESULTPRINTER CLASS IN YOUR ORIGINAL CODE. FOR SAMPLE ONLY
ResultPrinter::printError("Get Payment", "Payment", null, null, $ex);
exit(1);
}
// NOTE: PLEASE DO NOT USE RESULTPRINTER CLASS IN YOUR ORIGINAL CODE. FOR SAMPLE ONLY
return json_decode($payment, 128);
Where Payment Detail is:
array(10) {
["id"]=>
string(28) "PAY-1WL153218P032830GKZK2BLY"
["intent"]=>
string(4) "sale"
["state"]=>
string(7) "created"
["cart"]=>
string(17) "08X596883D298843B"
["payer"]=>
array(3) {
["payment_method"]=>
string(6) "paypal"
["status"]=>
string(8) "VERIFIED"
["payer_info"]=>
array(8) {
["email"]=>
string(32) "ted.chou12-facilitator#gmail.com"
["first_name"]=>
string(4) "test"
["last_name"]=>
string(11) "facilitator"
["payer_id"]=>
string(13) "GGYZW23EGRAY4"
["shipping_address"]=>
array(7) {
["recipient_name"]=>
string(16) "test facilitator"
["line1"]=>
string(22) "88 Des Voeux Road West"
["line2"]=>
string(6) "3F 520"
["city"]=>
string(9) "Hong Kong"
["state"]=>
string(9) "Hong Kong"
["postal_code"]=>
string(6) "000000"
["country_code"]=>
string(2) "HK"
}
["phone"]=>
string(10) "4088069385"
["country_code"]=>
string(2) "US"
["billing_address"]=>
array(6) {
["line1"]=>
string(22) "88 Des Voeux Road West"
["line2"]=>
string(6) "3F 520"
["city"]=>
string(9) "Hong Kong"
["state"]=>
string(9) "Hong Kong"
["postal_code"]=>
string(6) "000000"
["country_code"]=>
string(2) "HK"
}
}
}
["transactions"]=>
array(1) {
[0]=>
array(6) {
["amount"]=>
array(3) {
["total"]=>
string(7) "2340.00"
["currency"]=>
string(3) "TWD"
["details"]=>
array(3) {
["subtotal"]=>
string(7) "2310.00"
["tax"]=>
string(4) "0.00"
["shipping"]=>
string(5) "30.00"
}
}
["payee"]=>
array(1) {
["email"]=>
string(35) "jaypatel512-facilitator#hotmail.com"
}
["description"]=>
string(19) "Payment description"
["invoice_number"]=>
string(13) "5655a0adceedf"
["item_list"]=>
array(2) {
["items"]=>
array(3) {
[0]=>
array(5) {
["name"]=>
string(2) "25"
["sku"]=>
string(2) "11"
["price"]=>
string(6) "529.00"
["currency"]=>
string(3) "TWD"
["quantity"]=>
int(3)
}
[1]=>
array(5) {
["name"]=>
string(13) "Warrior Model"
["sku"]=>
string(2) "15"
["price"]=>
string(6) "180.00"
["currency"]=>
string(3) "TWD"
["quantity"]=>
int(1)
}
[2]=>
array(5) {
["name"]=>
string(7) "dim_sum"
["sku"]=>
string(2) "22"
["price"]=>
string(6) "543.00"
["currency"]=>
string(3) "TWD"
["quantity"]=>
int(1)
}
}
["shipping_address"]=>
array(7) {
["recipient_name"]=>
string(16) "test facilitator"
["line1"]=>
string(22) "88 Des Voeux Road West"
["line2"]=>
string(6) "3F 520"
["city"]=>
string(9) "Hong Kong"
["state"]=>
string(9) "Hong Kong"
["postal_code"]=>
string(6) "000000"
["country_code"]=>
string(2) "HK"
}
}
["related_resources"]=>
array(0) {
}
}
}
["redirect_urls"]=>
array(2) {
["return_url"]=>
string(97) "..."
["cancel_url"]=>
string(59) "..."
}
["create_time"]=>
string(20) "2015-11-25T11:51:10Z"
["update_time"]=>
string(20) "2015-11-25T11:51:10Z"
["links"]=>
array(3) {
[0]=>
array(3) {
["href"]=>
string(79) "..."
["rel"]=>
string(4) "self"
["method"]=>
string(3) "GET"
}
[1]=>
array(3) {
["href"]=>
string(87) ".../execute"
["rel"]=>
string(7) "execute"
["method"]=>
string(4) "POST"
}
[2]=>
array(3) {
["href"]=>
string(94) "..."
["rel"]=>
string(12) "approval_url"
["method"]=>
string(8) "REDIRECT"
}
}
}

Answer 1

Once you execute the payment, you will get back a sale=>id. That's the id you would use for a refund.
It will also include a full URI for you under transactions=>related_resources=>links with the 'rel' value of 'refund'.
Source: https://developer.paypal.com/docs/api/#refunds

Answer 2

Each of the payment will produce an sale_id as an example 4CFG677234DFG234F. This ID will be use to make a refund.
Don't get yourself confuse with the payment id and the sale_id.