Issue gift-card vouchers and adjust client loyalty points through the Phorest API.

Steps

1. Authenticate to the Phorest API for the target business.
2. Call the create-voucher endpoint to issue a new gift-card voucher; note that you must build the surrounding purchase/payment/email flow yourself (e.g., via Stripe).
3. Call the list-vouchers endpoint (optionally filtered by client id, serial number, or update date) to look up existing vouchers, including used ones if needed.
4. Call the get-voucher endpoint with a specific voucher id to check its balance/status before redemption.
5. Call the loyalty-points endpoint (.../business/{businessId}/loyaltypoints) to update a client's loyalty point balance.