Allowing custom app before setup
Before you begin, make sure you've allowed custom apps.
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You do this in the Apps section, which you will find on the left side:

Then click on Apps and Sales channels

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Click on Develop Apps:

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Setting up Shopify

Click on Create an app which is located in the top right corner:

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Name the app 'Claimlane' and choose the app developer. In most cases, you will only have one to choose from:
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Once done, tap on Create app.
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Then you will have this image:
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Firstly, click on

Configure/edit Admin API Scopes:
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Here you must check the following boxes:
​write_customers,
​write_orders - read_products,
​read_customers - read_orders- write_discounts
​read_discounts -write_price_rules
​read_price_rules - write_gift_cards
​read_gift_cards - read_inventory
​write_inventory
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Once you have done that, make sure that your Webhook subscription is set to the latest version.
Click Save

in the top right of the page.
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Click install app in the top right corner:(or just save if already installed)

Finally, go to Admin API access token and click

Reveal token once:
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Send this to claimlane along with the URL for the specific shopify shop