Log successful Adyen payments to Google Sheets and Slack

Set up a webhook trigger that receives Adyen AUTHORISATION notifications. For each notification where the success flag is true, run these two steps in order. When success is false, do nothing.

Step 1. Use the Google Sheets Append Values operation to add a new row to a designated ledger spreadsheet. Populate one column per field from the webhook payload: the event timestamp, pspReference, merchantReference, shopper email, amount, currency code, and payment method name. Adyen sends the amount value in the smallest currency unit, so divide by 100 for most currencies before writing it to the sheet so the ledger shows human amounts (for zero-decimal currencies like JPY, write the value as is).

Step 2. Use the Slack Bot Send a Message operation to post to a preconfigured Slack channel (default #payments). The message text should follow this exact format: "New payment: {amount} {currency} from {shopperEmail} (ref {merchantReference})".

No AI reasoning is required. The same fields flow from every payload into the same spreadsheet and the same Slack channel every time. This is a real-time payment ledger and is intentionally separate from any scheduled payment digest workflow.