Partner Referral in sellere onboarding

[Jigar7]

I am developing paypal integration by referencing this url: https://developer.paypal.com/docs/platforms/seller-onboarding/build-onboarding/

In step 2 embase sign up link: Seller is redirected to paypal , but when it is returned to return uri i am not receiving authcode.

I need authcode in return url. Im using vue js and it doesnt seem to work!