Download a single voucher as a PDF file.
Handles reissued vouchers by including redeemables from the current issue.
Requires view_orders permission.
GET
/vouchers/{uuid}/pdf
curl \
--request GET 'https://api.gb.enjovia.app/vouchers/abc12345-e89b-12d3-a456-426614174000/pdf' \
--header "Authorization: Bearer $ACCESS_TOKEN" \
--header "Account-ID: string"