Creating a trigger when send invoice button on Shopify clicked

Hi @vide 

Good question.

If possible, you would likely have to look into using Shopify Webhooks: https://help.shopify.com/en/manual/orders/notifications/webhooks#create-webhooks

Zap trigger: Webhook - Catch Hook

• From your Shopify admin, go to Settings > Notifications.
• Scroll down to the Webhooks section.
• Click the Create webhook button. A new window should appear.
• From the first drop-down, select the "Event" from the following list:
  • Cart creation: a webhook will be sent every time a cart is created.
  • Cart update: a webhook will be sent every time a cart is updated.
  • Checkout creation: a webhook will be sent every time a checkout is created.
  • Checkout deletion: a webhook will be sent every time a checkout is deleted.
  • Checkout update: a webhook will be sent every time a checkout is updated.
  • Collection creation: a webhook will be sent every time a collection is created.
  • Collection deletion: a webhook will be sent every time a collection is deleted.
  • Collection update: a webhook will be sent every time a collection is updated.
  • Customer group creation: a webhook will be sent every time a customer group is created.
  • Customer group deletion: a webhook will be sent every time a customer group is deleted.
  • Customer group update: a webhook will be sent every time a customer group is updated.
  • Customer creation: a webhook will be sent every time a new customer is created.
  • Customer deletion: a webhook will be sent every time a customer record is deleted.
  • Customer disable: a webhook will be sent every time a customer account is disabled.
  • Customer enable: a webhook will be sent every time a customer account is enabled.
  • Customer update: a webhook will be sent every time a customer record is updated.
  • Draft order creation: a webhook will be sent every time a draft order is created.
  • Draft order deletion: a webhook will be sent every time a draft order is deleted.
  • Draft order update: a webhook will be sent every time a draft order has been updated.
  • Fulfillment creation: a webhook will be sent every time a fulfillment is created on an order.
  • Fulfillment update: a webhook will be sent every time fulfillment is updated on an order.
  • Order cancellation: a webhook will be sent every time an order is canceled.
  • Order creation: a webhook will be sent every time an order is created.
  • Order deletion: a webhook will be sent every time an order is deleted.
  • Order edit: a webhook will be sent every time an order is edited.
  • Order fulfillment: a webhook will be sent every time an order is fulfilled.
  • Order payment: a webhook will be sent every time an order has been paid.
  • Order update: a webhook will be sent every time an order has been updated.
  • Product creation: a webhook will be sent every time a product has been created.
  • Product deletion: a webhook will be sent every time a product has been deleted.
  • Product update: a webhook will be sent every time a product has been updated.
  • Refund create: a webhook will be sent every time a refund is issued.
  • Shop update: a webhook will be sent every time a shop property is updated.
  • Theme creation: a webhook will be sent every time a theme is created.
  • Theme deletion: a webhook will be sent every time a theme is deleted.
  • Theme update: a webhook will be sent every time a theme property is updated.