The two sides
Google Ads
Create an offline (import) conversion action in Google Ads for each event you want, connect your account in SignalBridge, and map each SignalBridge event to its action. SignalBridge then uploads each conversion with the click ID, value, currency, order ID and consent signals. An event uploads only if it carries a Google click ID or consented email or phone.
Read the Google Ads referenceSquarespace
On a Squarespace Core, Plus or Advanced plan, paste your SignalBridge snippet into the Header field of Code Injection, and paste it again into the Order confirmation and Order status fields. Squarespace does not allow custom code on checkout pages. Place a test order and check that one Purchase appears with the right value, and use sb_track with Squarespace's order merge tags if it does not.
Read the Squarespace referenceThis pairing does not have a step-by-step guide of its own yet. The two references above cover the connection, the events and the limits for each side.