Given that the product tags are not standardized, it might be useful to do a deeper examination of the different versions of this.

Pinterest suggests product:price:amount, og:price:standard_amount, product:price:currency, og:brand, og:availability, and a ton of others

Facebook suggests the ones you mentioned, but with a different syntax

<!DOCTYPE html>
<html>
 <head prefix=
    "og: http://ogp.me/ns# 
     fb: http://ogp.me/ns/fb# 
     product: http://ogp.me/ns/product#">
    <meta property="og:type"                   content="og:product" />
    <meta property="og:title"                  content="Friend Smash Coin" />
    <meta property="og:image"                  content="http://www.friendsmash.com/images/coin_600.png" />
    <meta property="og:description"            content="Friend Smash Coins to purchase upgrades and items!" />
    <meta property="og:url"                    content="http://www.friendsmash.com/og/coins.html" />
    <meta property="product:plural_title"      content="Friend Smash Coins" />
    <meta property="product:price:amount"      content="0.30"/>
    <meta property="product:price:currency"    content="USD"/>
    <meta property="product:price:amount"      content="0.20"/>
    <meta property="product:price:currency"    content="GBP"/>
  </head>
</html>

Shopify has different recommendations.

We should also check Google too to see what they expect.

Amazon does not use any sort of tags for pricing information.

collect all og tags #25

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