Adding Odoo 18 readme.

README.md

@@ -1,11 +1,12 @@
-# BTCPay Server payment gateway for Odoo 16 and 17
+# BTCPay Server payment gateway for Odoo 16, 17 and 18
 
-## Accept bitcoin payments on Odoo 16 and 17
+## Accept bitcoin payments on Odoo 16, 17 and 18
 This odoo addon allows you to accept bitcoin and Lightning Network (and other cryptocurrency) payments in your Odoo e-commerce store.  
 ![BTCPay Server Banner](https://raw.githubusercontent.com/btcpayserver/odoo/17.0/payment_btcpayserver/static/description/BTCPay-Odoo-17-featured.png)
 
 ## How to install
 
 Please find the installation instructions here:
+- [Odoo 18 documentation](https://github.com/btcpayserver/odoo/blob/18.0/payment_btcpayserver/README.md)
 - [Odoo 17 documentation](https://github.com/btcpayserver/odoo/blob/17.0/payment_btcpayserver/README.md)
 - [Odoo 16 documentation](https://github.com/btcpayserver/odoo/blob/16.0/payment_btcpayserver/README.md)

payment_btcpayserver/README.md

@@ -62,3 +62,7 @@ In transaction object, you will find more technical information about this metho
 * Transaction Status: That indicates state of transaction
 
 ![Transaction details of BTCPay](https://raw.githubusercontent.com/btcpayserver/odoo/17.0/payment_btcpayserver/static/description/BtcpayTxDetails.png)
+
+## Troubleshooting
+### The order and transaction status does not get updated to "paid"
+If the BTCPay connection generally works, like redirect to BTCPay checkout page (QR-code) then check your odoo logs and make sure PDF generation generally works. If there are errors mentioning wkhtmltopdf then you need to install `wkhtmltopdf` on your server.