in packages/oauth-client/src/OAuthClient.ts [134:153]
async handleCallback() {
if (isCallbackFromIframe()) {
notifyParentFromIframe();
return;
}
const url = new URL(window.location.href);
const handshakeState = await this.#getHandshakeState();
if (!handshakeState) {
throw new Error('handshake state not found');
}
const grant = getGrantFromCallbackUrl(url, handshakeState);
await this.#requestAndStoreToken(grant);
await this.#deleteHandshakeState();
window.location.href = handshakeState.originalUrl;
}