Profile: Support

Upgrade the plugin and check this claim for Google OAuth
          ClaimActions.MapJsonKey(ClaimTypes.AuthenticationMethod, "GoogleOAuth");

I'll add it.
Open the native Facebook OAuth plugin and show me the place when you want to add it.

I have understood you.
You want to know if the user uses Google Sing In or Nopcommerce Login.
You can create the plugin and check if the customer was SignIn  from nopcommerce login and save the information about it in the cookies/or in the table.
By default nopcommerce doesn't have this feature.

The customer account is linked to the ExternalAuthenticationRecord

Thank you for your report about this issue.

Upgrade the plugin. I have done it.
Try the new release and write to me about the result.

I think it's not correct to send zero if the product has zero.
I can do it but I want to add you to speak with Stamps.com support.
Ask Stamps.com support if we are able to send zero as dimensions and weight in decimal format.
If Stamps.com support approve it I'll do it.

Do you mean that the Stamps.com plugin upload the rounded weight to API?
What nopcommerce version do you use?

Can you write a review about our support?
https://www.nopcommerce.com/en/stampscom-connector-foxnetsoftcom
Thank you

Fixed.
The shipping service "USPS Parcel Select" has the same ID  USPS.
I renamed it.