curl --request PATCH \
  --url https://api.jtl-cloud.com/erp/v1/items/{itemId}/suppliers/{supplierId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'x-tenant-id: <x-tenant-id>' \
  --data '
{
  "Sku": "<string>",
  "ItemName": "<string>",
  "IsStandard": true,
  "PurchasePriceNet": 123,
  "TaxRate": 123,
  "MinimumPurchaseQuantity": 123,
  "PermissibleOrderQuantity": 123,
  "DeliveryTime": 123,
  "UseSupplierDeliveryTime": true,
  "Stocklevel": 123,
  "IsDropshipping": true,
  "MergeStockLevel": true,
  "Comment": "<string>",
  "PackagingUnit": "<string>",
  "AmountPackagingUnit": 123,
  "ScalePrices": [
    {
      "FromQuantity": 123,
      "PurchasePriceNet": 123,
      "ReduceStandardPriceByPercent": 123
    }
  ]
}
'

import requests

url = "https://api.jtl-cloud.com/erp/v1/items/{itemId}/suppliers/{supplierId}"

payload = {
    "Sku": "<string>",
    "ItemName": "<string>",
    "IsStandard": True,
    "PurchasePriceNet": 123,
    "TaxRate": 123,
    "MinimumPurchaseQuantity": 123,
    "PermissibleOrderQuantity": 123,
    "DeliveryTime": 123,
    "UseSupplierDeliveryTime": True,
    "Stocklevel": 123,
    "IsDropshipping": True,
    "MergeStockLevel": True,
    "Comment": "<string>",
    "PackagingUnit": "<string>",
    "AmountPackagingUnit": 123,
    "ScalePrices": [
        {
            "FromQuantity": 123,
            "PurchasePriceNet": 123,
            "ReduceStandardPriceByPercent": 123
        }
    ]
}
headers = {
    "x-tenant-id": "<x-tenant-id>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PATCH',
  headers: {
    'x-tenant-id': '<x-tenant-id>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    Sku: '<string>',
    ItemName: '<string>',
    IsStandard: true,
    PurchasePriceNet: 123,
    TaxRate: 123,
    MinimumPurchaseQuantity: 123,
    PermissibleOrderQuantity: 123,
    DeliveryTime: 123,
    UseSupplierDeliveryTime: true,
    Stocklevel: 123,
    IsDropshipping: true,
    MergeStockLevel: true,
    Comment: '<string>',
    PackagingUnit: '<string>',
    AmountPackagingUnit: 123,
    ScalePrices: [{FromQuantity: 123, PurchasePriceNet: 123, ReduceStandardPriceByPercent: 123}]
  })
};

fetch('https://api.jtl-cloud.com/erp/v1/items/{itemId}/suppliers/{supplierId}', 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://api.jtl-cloud.com/erp/v1/items/{itemId}/suppliers/{supplierId}",
  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([
    'Sku' => '<string>',
    'ItemName' => '<string>',
    'IsStandard' => true,
    'PurchasePriceNet' => 123,
    'TaxRate' => 123,
    'MinimumPurchaseQuantity' => 123,
    'PermissibleOrderQuantity' => 123,
    'DeliveryTime' => 123,
    'UseSupplierDeliveryTime' => true,
    'Stocklevel' => 123,
    'IsDropshipping' => true,
    'MergeStockLevel' => true,
    'Comment' => '<string>',
    'PackagingUnit' => '<string>',
    'AmountPackagingUnit' => 123,
    'ScalePrices' => [
        [
                'FromQuantity' => 123,
                'PurchasePriceNet' => 123,
                'ReduceStandardPriceByPercent' => 123
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json",
    "x-tenant-id: <x-tenant-id>"
  ],
]);

$response = curl_exec($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://api.jtl-cloud.com/erp/v1/items/{itemId}/suppliers/{supplierId}"

	payload := strings.NewReader("{\n  \"Sku\": \"<string>\",\n  \"ItemName\": \"<string>\",\n  \"IsStandard\": true,\n  \"PurchasePriceNet\": 123,\n  \"TaxRate\": 123,\n  \"MinimumPurchaseQuantity\": 123,\n  \"PermissibleOrderQuantity\": 123,\n  \"DeliveryTime\": 123,\n  \"UseSupplierDeliveryTime\": true,\n  \"Stocklevel\": 123,\n  \"IsDropshipping\": true,\n  \"MergeStockLevel\": true,\n  \"Comment\": \"<string>\",\n  \"PackagingUnit\": \"<string>\",\n  \"AmountPackagingUnit\": 123,\n  \"ScalePrices\": [\n    {\n      \"FromQuantity\": 123,\n      \"PurchasePriceNet\": 123,\n      \"ReduceStandardPriceByPercent\": 123\n    }\n  ]\n}")

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

	req.Header.Add("x-tenant-id", "<x-tenant-id>")
	req.Header.Add("Authorization", "Bearer <token>")
	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://api.jtl-cloud.com/erp/v1/items/{itemId}/suppliers/{supplierId}")
  .header("x-tenant-id", "<x-tenant-id>")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"Sku\": \"<string>\",\n  \"ItemName\": \"<string>\",\n  \"IsStandard\": true,\n  \"PurchasePriceNet\": 123,\n  \"TaxRate\": 123,\n  \"MinimumPurchaseQuantity\": 123,\n  \"PermissibleOrderQuantity\": 123,\n  \"DeliveryTime\": 123,\n  \"UseSupplierDeliveryTime\": true,\n  \"Stocklevel\": 123,\n  \"IsDropshipping\": true,\n  \"MergeStockLevel\": true,\n  \"Comment\": \"<string>\",\n  \"PackagingUnit\": \"<string>\",\n  \"AmountPackagingUnit\": 123,\n  \"ScalePrices\": [\n    {\n      \"FromQuantity\": 123,\n      \"PurchasePriceNet\": 123,\n      \"ReduceStandardPriceByPercent\": 123\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.jtl-cloud.com/erp/v1/items/{itemId}/suppliers/{supplierId}")

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

request = Net::HTTP::Patch.new(url)
request["x-tenant-id"] = '<x-tenant-id>'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"Sku\": \"<string>\",\n  \"ItemName\": \"<string>\",\n  \"IsStandard\": true,\n  \"PurchasePriceNet\": 123,\n  \"TaxRate\": 123,\n  \"MinimumPurchaseQuantity\": 123,\n  \"PermissibleOrderQuantity\": 123,\n  \"DeliveryTime\": 123,\n  \"UseSupplierDeliveryTime\": true,\n  \"Stocklevel\": 123,\n  \"IsDropshipping\": true,\n  \"MergeStockLevel\": true,\n  \"Comment\": \"<string>\",\n  \"PackagingUnit\": \"<string>\",\n  \"AmountPackagingUnit\": 123,\n  \"ScalePrices\": [\n    {\n      \"FromQuantity\": 123,\n      \"PurchasePriceNet\": 123,\n      \"ReduceStandardPriceByPercent\": 123\n    }\n  ]\n}"

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

{
  "ErrorCode": "<string>",
  "ValidationErrors": {},
  "Errors": {},
  "ErrorMessage": "<string>",
  "Stacktrace": "<string>"
}

{
  "ErrorCode": "<string>",
  "ValidationErrors": {},
  "Errors": {},
  "ErrorMessage": "<string>",
  "Stacktrace": "<string>"
}