How can i use the PayPal payment service to receive payment in Xamarin Forms app.

[Devanshu]

At present I created an account in the developer.paypal.com and used the email address for the business account to make payment inside the app with the help of below package for xamarin forms:

https://github.com/AlejandroRuiz/PayPal.Forms

I tried many ways like I also created an account over sanbox.paypal.com and linked to the account of developer.paypal.com but I always ended up with the error message like:
Payments to this merchant are not allowed(Invalid client Id)

I also tried using the Merchant ID in place of the email id in the Paypal configuration but still no luck.

Please help me in setting up the account properly and guide me for the implementation of the same.