我的前端使用Reactjs，后端使用Springboot和Firebase。基本上，当用户注册一个帐户时，我会调用两个API将帐户发布到Firebase和我的Springboot服务器，原因是我需要使用我自己的Springboot服务器中收集的用户数据。
我面临的问题是，在用户注册一个帐户后，在调用Firebase API后，不会调用Springboot API。（我先调用Firebase API，然后再调用Springboot API）在我看来，在调用Firebase API后，一切都停止了，代码不再继续，因此不再调用API。
如何确保可以依次调用这两个API，然后将用户重定向到下一个页面而不受任何干扰？
在Reactjs中提交时注册：

const handleOnSubmit=(event: React.FormEvent<HTMLFormElement>)=> {

        if (password !== secondPassword) {
            setPasswordsMatched(false);
            console.log("passwords matched when password!==secondPassword:" + passwordsMatched);
        } else if(!username){
            setUsernameExists(false);
        }else if(!email){
            setEmailExists(false);
        }else if(!password||!secondPassword){
            setPasswordExists(false);
        }else{
            if(subscribedStatus){
                let subscribed:string="subscribed";
                firebaseAuthServiceSignUpWithEmailAndPassword(username,email,password,subscribed,handleSignupSuccess);
            }else{
                let subscribed:string="unsubscribed";
                firebaseAuthServiceSignUpWithEmailAndPassword(username,email,password,subscribed,handleSignupSuccess);
            }
        }
}

//This is the callback function put inside the Firebase API to see if Firebase accepts the registration. If yes, the user is redirected to "/verification-email"
const handleSignupSuccess=(signupStatus:boolean)=>{
        setSignupSuccess(signupStatus);
        if(signupStatus){
            firebaseAuthServiceEmailVerification(setEmailVerificationSent);
            navigate("/verification-email");
        }
}

Firebase API：

export const firebaseAuthServiceSignUpWithEmailAndPassword= (username:string,email: string, password: string, subscribed:string,callback: (isSuccess:boolean)=>void) =>{
    const auth = getAuth();
    createUserWithEmailAndPassword(auth, email, password)
        .then(async ( userCredential) => {
            // Signed in
            const user = userCredential.user;
            await postAccount(username, email, password, user.uid, subscribed);
            callback(true);
        })
        .catch((error) => {
            const errorCode = error.code;
            const errorMessage = error.message;
            callback(false);
            // ..
        });
}

Spring启动API：

export const postAccount=(username:string,email:string,password:string,firebaseUid:string,subscribedStatus:string)=>{
    axios.post(`http://localhost:8080/user/${username}/${email}/${password}/${firebaseUid}/${subscribedStatus}`
    )
        .then((res)=>{

        }).catch((error)=>{
            console.log(error);
        })
}