public void setProvider(String provider) {
        this.provider = provider;
    }
<p>
The issuing authority of the web identity token presented. For OpenID Connect ID tokens, this contains the value
of the <code>iss</code> field. For OAuth 2.0 access tokens, this contains the value of the
<code>ProviderId</code> parameter that was passed in the <code>AssumeRoleWithWebIdentity</code> request.
</p>

@param provider
       The issuing authority of the web identity token presented. For OpenID Connect ID tokens, this contains the
       value of the <code>iss</code> field. For OAuth 2.0 access tokens, this contains the value of the
       <code>ProviderId</code> parameter that was passed in the <code>AssumeRoleWithWebIdentity</code> request.
aws-java-sdk-sts/src/main/java/com/amazonaws/services/securitytoken/model/AssumeRoleWithWebIdentityResult.java