Follow the below instructions for find your Shopify API access -
Provide Correct store link to verify URL, (example url provided on integration page). Click on Check Shopify Url button to verify
Once the URl verification finish, you will see the Start integration Setup button.Click on Start integration Setup button
It will re-direct you to Shopify login page for authorization. It may skip if you already loged in to your Shopify account or may show different login page.
On Shopify admin- Settings page, it will ask you to install the OMS app
Once the Installation complete Shopify, it will redirect you to OMS integration page where you will see if the integration setup successful or failed.
Please open the ticket for your enquriy.