You can find Wallet UI branding guidelines (including logos, acceptance badges, etc.) in the Wallet developers documentation site:
https://developers.google.com/commerce/wallet/instant-buy/ui-branding#acceptance_graphics_usage
Question
For Google Wallet Digital Goods,
a) is there any icon/graphic thing we can use on the main page/landing page to advertise that we're using Google Wallet?
b) does Google provide a checkout/buy button?
La solution
You can find Wallet UI branding guidelines (including logos, acceptance badges, etc.) in the Wallet developers documentation site:
https://developers.google.com/commerce/wallet/instant-buy/ui-branding#acceptance_graphics_usage
Autres conseils
UI branding assets for "Google Wallet for digital goods" can be found here.
a) There currently isn't an official acceptance logo, but you could copy just the image from: https://checkout.google.com/seller/acceptance_logos.html and use that.
b) We don't force a buy button, you can use any that you want.
This image should get the point across:
https://checkout.google.com/seller/images/acceptancelogo/logo-0-f-en_us.png