Just installed 1.6 and there is only Stripe available as payment option,
How to use PayPal?
Most likely you have to
composer require paypal and then implement the functionality.
First: in the omnipay list, see if paypal is in there: GitHub - thephpleague/omnipay: A framework agnostic, multi-gateway payment processing library for PHP 5.6+
If it doesn’t have a checkmark in the ‘v3’ column, it’s not there yet
PayPal is marked on v3 and v2, what should I do to enable the PayPal?
Hi @Zeeshan_A_Qureshi InvoicePlane v1.6.0 and v1.6.1 still do not support natively PayPal as a gateway (see the braking changes when upgrading from v1.5 to v1.6 here: Update InvoicePlane - InvoicePlane Wiki). This means that there is no easy way to “activate” PayPal in InvoicePlane v1.6. To use PayPal in InvoicePlane v1.6 you must include an Omnipay Paypal library and then code the functionality into InvoicePlane.
If you want you are free to help us code a PayPal functionality into InvoicePlane or wait for an update in the future that will include PayPal as a gateway (maybe already v1.6.2).