Yes, have found it:
dh = CryptoPP::ECDH<CryptoPP::ECP,
CryptoPP::NoCofactorMultiplication>::Domain(curve);
CryptoPP::DH2 dh2(dh);
...
string foreign_ephemeral_pub_key("...some base64...");//accepting ephemeral
pub key from googlePay request
string google_ephemeral_pub_key_decoded =
base64_decode(foreign_ephemeral_pub_key);
CryptoPP::SecByteBlock google_pubKey((const CryptoPP::byte*)
google_public_key.data(), dh2.StaticPublicKeyLength());//here
using google_public_key, just from google, also base64, also decoded.
Refreshes sometimes, you may update it one time a day
CryptoPP::SecByteBlock google_ephKey((const CryptoPP::byte*)
google_ephemeral_pub_key.data(), dh2.EphemeralPublicKeyLength());
And then just moving further - to combined secret and so on.
I planned prepare full googlePay-decoder code for wiki, but really, don't
have time for it.
Hope, that helps.
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