(Delphi DLL) Shopify Update Inventory Level for a Product (Adjust available quantity)

Use the adjust endpoint with the location ID and inventory item ID to increase or decrease the available quantity for an inventory level:

For more information, see https://shopify.dev/tutorials/manage-product-inventory-with-admin-api#update-inventory-levels-for-a-product-variant

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Http, HttpResponse, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: HCkHttp;
jsonRequestBody: HCkJsonObject;
url: PWideChar;
resp: HCkHttpResponse;
jsonResponse: HCkJsonObject;
inventory_levelInventory_item_id: Integer;
inventory_levelLocation_id: Integer;
inventory_levelAvailable: Integer;
inventory_levelUpdated_at: PWideChar;
inventory_levelAdmin_graphql_api_id: PWideChar;

begin
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

http := CkHttp_Create();

CkHttp_putLogin(http,'SHOPIFY_PRIVATE_API_KEY');
CkHttp_putPassword(http,'SHOPIFY_PRIVATE_API_KEY');

// Also see: How to retrieve inventory levels

CkHttp_putAccept(http,'application/json');

// The following JSON is sent in the request body:

// {
//   "location_id": 6884556842,
//   "inventory_item_id": 12250274365496,
//   "available_adjustment": 1
// }

// Use this online tool to generate the code from sample JSON: 
// Generate Code to Create JSON

jsonRequestBody := CkJsonObject_Create();
CkJsonObject_UpdateInt(jsonRequestBody,'location_id',6884556842);
CkJsonObject_UpdateInt(jsonRequestBody,'inventory_item_id',12250274365496);
CkJsonObject_UpdateInt(jsonRequestBody,'available_adjustment',1);

url := 'https://{shop}.myshopify.com/admin/api/2020-04/inventory_levels/adjust.json';

resp := CkHttp_PText(http,'POST',url,CkJsonObject__emit(jsonRequestBody),'utf-8','application/json',False,False);
if (CkHttp_getLastMethodSuccess(http) <> True) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

Memo1.Lines.Add('Response Status Code: ' + IntToStr(CkHttpResponse_getStatusCode(resp)));

jsonResponse := CkJsonObject_Create();
CkJsonObject_Load(jsonResponse,CkHttpResponse__bodyStr(resp));
CkJsonObject_putEmitCompact(jsonResponse,False);
Memo1.Lines.Add(CkJsonObject__emit(jsonResponse));

if (CkHttpResponse_getStatusCode(resp) >= 300) then
  begin
    Memo1.Lines.Add('Failed.');
    CkHttpResponse_Dispose(resp);
    Exit;
  end;

CkHttpResponse_Dispose(resp);

// Sample output...
// (See the parsing code below..)
// 
// Use the this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

// {
//   "inventory_level": {
//     "inventory_item_id": 12250274365496,
//     "location_id": 6884556842,
//     "available": 9,
//     "updated_at": "2018-06-26T15:04:49-04:00",
// ...
//     "admin_graphql_api_id": "gid://shopify/InventoryLevel/6485147690?inventory_item_id=12250274365496"
// ...
//   }
// }
// 

inventory_levelInventory_item_id := CkJsonObject_IntOf(jsonResponse,'inventory_level.inventory_item_id');
inventory_levelLocation_id := CkJsonObject_IntOf(jsonResponse,'inventory_level.location_id');
inventory_levelAvailable := CkJsonObject_IntOf(jsonResponse,'inventory_level.available');
inventory_levelUpdated_at := CkJsonObject__stringOf(jsonResponse,'inventory_level.updated_at');
inventory_levelAdmin_graphql_api_id := CkJsonObject__stringOf(jsonResponse,'inventory_level.admin_graphql_api_id');

CkHttp_Dispose(http);
CkJsonObject_Dispose(jsonRequestBody);
CkJsonObject_Dispose(jsonResponse);

end;