Make sure you have the service and integration already setup for Sentry. Follow the link below on instructions of how to create integration and service
The main difference is in how you choose to configure and integrate on Sentry's dashboard. Here are the two approaches -
Sentry webhook integration takes the approach by pasting the webhook link on Sentry.
Sentry native integration is a published 1-click install app published on Sentry.
Both Sentry webhook and Sentry native integration are created the same way you would create any other integration i.e. by going to New Integration section on dashboard.
Step 1: On Sentry, go to settings > Integrations and select Webhook
Paste your copied webhook from Spike.sh to Sentry's webhook integration.
Step 2: Set up alerts
Visit Sentry's new Alerts section from the sidebar and select Create Alert Rule
Add your conditions for alerts and in actions select Send a notification via an integration
This should be the end result.