curl --request PATCH \
  --url https://prod01-apigw.{customer_name}.fabric.zone/api-cart/cart/apply-promo \
  --header 'Content-Type: application/json' \
  --header 'x-site-context: <x-site-context>' \
  --data '
{
  "cartId": "5e5ebf27f1f734055d035833",
  "promoName": "CR100"
}
'

import requests

url = "https://prod01-apigw.{customer_name}.fabric.zone/api-cart/cart/apply-promo"

payload = {
    "cartId": "5e5ebf27f1f734055d035833",
    "promoName": "CR100"
}
headers = {
    "x-site-context": "<x-site-context>",
    "Content-Type": "application/json"
}

response = requests.patch(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'PATCH',
  headers: {'x-site-context': '<x-site-context>', 'Content-Type': 'application/json'},
  body: JSON.stringify({cartId: '5e5ebf27f1f734055d035833', promoName: 'CR100'})
};

fetch('https://prod01-apigw.{customer_name}.fabric.zone/api-cart/cart/apply-promo', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://prod01-apigw.{customer_name}.fabric.zone/api-cart/cart/apply-promo",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'cartId' => '5e5ebf27f1f734055d035833',
    'promoName' => 'CR100'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "x-site-context: <x-site-context>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://prod01-apigw.{customer_name}.fabric.zone/api-cart/cart/apply-promo"

	payload := strings.NewReader("{\n  \"cartId\": \"5e5ebf27f1f734055d035833\",\n  \"promoName\": \"CR100\"\n}")

	req, _ := http.NewRequest("PATCH", url, payload)

	req.Header.Add("x-site-context", "<x-site-context>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.patch("https://prod01-apigw.{customer_name}.fabric.zone/api-cart/cart/apply-promo")
  .header("x-site-context", "<x-site-context>")
  .header("Content-Type", "application/json")
  .body("{\n  \"cartId\": \"5e5ebf27f1f734055d035833\",\n  \"promoName\": \"CR100\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://prod01-apigw.{customer_name}.fabric.zone/api-cart/cart/apply-promo")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Patch.new(url)
request["x-site-context"] = '<x-site-context>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"cartId\": \"5e5ebf27f1f734055d035833\",\n  \"promoName\": \"CR100\"\n}"

response = http.request(request)
puts response.read_body

{
  "deleted": false,
  "allPromosApplied": [
    {
      "promoId": "5ddd1a156c5a5fed1e0d91fb",
      "promoCode": "10_DOLLORS_OFF_123"
    }
  ],
  "items": [
    {
      "itemId": 1000000012,
      "quantity": 2,
      "price": {
        "currency": "USD",
        "base": 15.99,
        "discount": {
          "price": 10.99,
          "discountAmount": 10.99,
          "promosApplied": [
            {
              "unit": "<string>",
              "value": 123,
              "ON": {
                "kind": "SKU",
                "value": ""
              },
              "id": "<string>",
              "promoId": "<string>",
              "promoCode": "<string>"
            }
          ]
        },
        "sale": 10.99
      },
      "group": [
        "5ddd1a156c5a5fed1e0d91fb"
      ],
      "priceListId": 100002,
      "isUnique": 123,
      "discountedQuantity": 0,
      "lineItemId": 1,
      "totalPrice": {
        "currency": "USD",
        "amount": 200
      },
      "id": "5fee9d59f2f08a1b3cbdea08",
      "sample": false,
      "weightUnit": "kg",
      "isPickup": false,
      "sku": "blue",
      "taxCode": "PH0607",
      "title": "item title",
      "weight": 7,
      "attributeTotalPrice": 0,
      "attributes": [
        {
          "price": 10,
          "_id": "6146e98408e3700008b64611",
          "attributeId": "60a77de306f682000975c24c",
          "value": "true/false",
          "name": "Gift Message",
          "type": "<string>",
          "id": "6146e98408e3700008b64611",
          "shipTo": {
            "street1": "123 Main Street",
            "city": "Seattle",
            "state": "WA",
            "country": "United States of America",
            "zipCode": "10008-1234",
            "name": {
              "first": "John",
              "last": "Smith"
            },
            "email": "johnsmith@fabric.inc",
            "_id": "5fee9d59f2f08a1b3cbdea08",
            "createdAt": "2020-12-31T02:09:53.914Z",
            "updatedAt": "2020-12-31T02:09:53.914Z",
            "attention": "Leave at the back door.",
            "street2": "ABC Boulevard",
            "kind": "TBD",
            "phone": {
              "number": "123-456-7890",
              "kind": "Mobile"
            },
            "shipTo": {
              "shipMethod": {
                "shipMethodId": "1a2b3c4d5e6f7g8h9i0j",
                "shipmentCarrier": "Fedex",
                "shipmentMethod": "Next Day",
                "cost": {
                  "currency": "USD",
                  "amount": 5.99
                }
              }
            },
            "shipToId": 5269,
            "cartId": "61e03ff6a865fe00094f8620",
            "taxCode": "FR1000",
            "shipToType": "SHIP_TO_ADDRESS"
          }
        }
      ],
      "_id": "5fee9d59f2f08a1b3cbdea08",
      "createdAt": "2020-12-31T02:09:53.914Z",
      "updatedAt": "2020-12-31T02:09:53.914Z"
    }
  ],
  "registeredUser": false,
  "cartId": 4,
  "totalAmmount\"": {
    "currency": "USD",
    "amount": 200
  },
  "quantity": 2,
  "__v": 0,
  "attributes": [
    {
      "price": 10,
      "_id": "6146e98408e3700008b64611",
      "attributeId": "60a77de306f682000975c24c",
      "value": "true/false",
      "name": "Gift Message",
      "type": "<string>",
      "id": "6146e98408e3700008b64611"
    }
  ],
  "account": "<string>",
  "approver": "<string>",
  "po": "<string>",
  "company": "<string>",
  "status": "pending",
  "extra": {},
  "errors": {
    "inventory": "<array>",
    "price": "<array>",
    "promo": "<array>"
  },
  "_id": "5fee9d59f2f08a1b3cbdea08",
  "createdAt": "2020-12-31T02:09:53.914Z",
  "updatedAt": "2020-12-31T02:09:53.914Z"
}

{
  "code": "PROMO_ALREADY_APPLIED",
  "message": "TEST20 has already been applied."
}

{
  "code": "PROMO_NOT_FOUND",
  "message": "The promotion code you entered doesn’t exist."
}

{
  "code": "<string>",
  "message": "<string>"
}