loadCredentialOffer
Loads the CredentialOffer from input, which is either a JSON-encoded credential offer, or a credential offer URL with an embedded credential_offer (by value) or a credential_offer_uri (by reference). The resource at credential_offer_uri is the JSON-encoded credential offer, see CredentialOfferUrlParameters; another credential offer URL in its place is rejected.
Sends no request for a credential offer passed by value, and CredentialOffer for one passed by reference.