Apply third-party Shopify discounts to subscriptions

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Why third-party app discounts don’t always carry over

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Apply the discount with Shopify Flow

1. Create the recurring discount once in Firmhouse.
2. Get a Firmhouse Project Access Token.
3. Set up a Shopify Flow that runs after checkout, looks up the new subscription, and applies the Firmhouse discount to it.

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1. Create the recurring discount in Firmhouse

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2. Get a Firmhouse Project Access Token

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3. Create the Shopify Flow

1. Trigger: Order created (or another event that matches when the third-party app applies its discount, for example Customer tags added for B2B-tag based flows).
2. Condition (optional): Add a condition that limits the workflow to the orders you want. For example, only run when the customer has a specific tag (b2b) or when a specific discount code or app is involved.
3. First action — look up the Firmhouse subscription: Add a Send HTTP request action that calls the Firmhouse API to find the subscription for this Shopify order:
   • URL: https://portal.firmhouse.com/graphql
   • HTTP method: POST
   • Headers:
     • Content-Type: application/json
     • X-Project-Access-Token: <your Firmhouse Project Access Token>
   • Body:
     {
       "query": "query($shopifyId: String!) { getOrderBy(shopifyId: $shopifyId) { subscription { id } } }",
       "variables": {
         "shopifyId": "{{order.id}}"
       }
     }
     
   In the response, the subscription ID is at data.getOrderBy.subscription.id. Save this for the next step using the standard Flow output mapping.
4. Second action — apply the Firmhouse discount to the subscription: Add another Send HTTP request action that calls the applyPromotionToSubscription mutation:
   • URL: https://portal.firmhouse.com/graphql
   • HTTP method: POST
   • Headers: same as above.
   • Body:
     {
       "query": "mutation($subscriptionId: ID!, $promotionId: ID!) { applyPromotionToSubscription(input: { subscriptionId: $subscriptionId, promotionId: $promotionId }) { appliedPromotion { id } errors { attribute message } } }",
       "variables": {
         "subscriptionId": "<subscription id from previous step>",
         "promotionId": "<your Firmhouse promotion id>"
       }
     }
     

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Verify it worked

1. Place a test order that meets the third-party app’s discount conditions (for example, a checkout with a customer that has the right tag).
2. In Firmhouse, open the new subscription and check the Applied discounts section — your discount should be listed there.
3. Look at the next scheduled order or invoice on the subscription to confirm the discount is calculated.

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Tips

• Create a separate Firmhouse discount (and a matching Flow branch) per customer segment if you offer different percentages.
• If the third-party app changes the discount it gives at checkout, update the matching Firmhouse discount accordingly so the recurring orders stay in sync.
• If you also want Firmhouse to enforce the same product or price requirements that an automatic discount would, add validatePromotion: true to the mutation input.

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Related articles

• Giving discounts to your customers
• Discounts on Shopify Checkout
• Use Shopify Flow Triggers
• API Access Tokens