Collect Xero invoice payments with Stripe Payment Links via WhatsApp

## Collect Xero invoice payments with Stripe Payment Links on WhatsApp ### How it works This workflow listens for Xero invoice webhooks, verifies the webhook signature, and processes approved sales invoices. For each eligible invoice, it checks whether a Stripe Payment Link already exists; if not, it fetches contact details, validates a WhatsApp number, creates a Stripe price and payment link, saves it, and sends it via WhatsApp. A separate Stripe payment-success path records paid invoices back into Xero, handles Stripe fees with an optional journal entry, and updates the local link/payment tracking table. Failure and duplicate-payment branches notify Slack. ### Setup steps - Configure the Xero webhook URL and signing secret, and set up Xero API/OAuth credentials with access to invoices, contacts, payments, and manual journals. - Configure Stripe credentials for creating prices/payment links and for the payment-succeeded trigger; ensure Stripe metadata includes enough invoice/link identifiers for reconciliation. - Set up the n8n Data Tables used for payment-link lookup, saved links, sent/paid status, and account configuration mappings. - Configure the WAHA host/session settings for WhatsApp number checks and message sending. - Connect Slack credentials and choose channels for duplicate payment and workflow failure alerts. - Review the Xero tenant ID, Stripe product/price parameters, Xero bank/account codes, fee journal account codes, and WhatsApp message template values in the code and HTTP request nodes. ### Customization Customize the invoice eligibility filter, WhatsApp message wording, Stripe Payment Link options, duplicate-payment alert behavior, and Xero account mappings for your chart of accounts and collection process.