How to terminate My function, it is working but never ending - node.js

Question

I use the api mangopay for my app. The function to transfered worked but it never end until I refresh my page. I have no error code, the function still working but we can't get the message: 'the money is transfered'
Maybe I forgot something on my function ?
transfertMangoReferent: (req, res) => {
Serveur.findOne(
{ email: req.body.email },
"mangoWallet abonne",
(err, user) => {
if (user.abonne === true) {
api.Transfers.create(
{
AuthorId: req.user.mangoID,
DebitedFunds: {
Currency: "EUR",
Amount: req.body.amount * 100,
},
Fees: {
Currency: "EUR",
Amount: req.body.amount * 100 * 0.15,
},
DebitedWalletId: req.user.mangoWalletReferent,
CreditedWalletId: user.mangoWallet,
Tag: "Versement du pot Commun",
},
(model) => {
(error) => {
if (error) {
res.status(500).json({
message: "An error has occured with MANGO users",
});
}else{
res.json(model)
}
};
}
);
} else {
api.Transfers.create(
{
AuthorId: req.user.mangoID,
DebitedFunds: {
Currency: "EUR",
Amount: req.body.amount * 100,
},
Fees: {
Currency: "EUR",
Amount: req.body.amount * 100 * 0.25,
},
DebitedWalletId: req.user.mangoWalletReferent,
CreditedWalletId: user.mangoWallet,
Tag: "Versement du pot Commun",
},
(model) => {
(error) => {
if (error) {
res.status(500).json({
message: "An error has occured with MANGO users",
});
} else {
res.json(model)
}
};
}
);
}
}
);
},
On my network when i click to my button validate i have just the code 200
I can give you also my fetch in a react js
<Button
className="CollectButton"
type="submit"
onClick={() => {
const headers = new Headers({
"Content-Type": "application/json",
Authorization: "bearer " + localStorage.getItem("token"),
});
const data = {
email: element.serveurMail,
amount: this.state.referent.amount,
};
const options = {
method: "POST",
headers: headers,
body: JSON.stringify(data),
};
fetch("https://back-end.osc-fr1.scalingo.io/serveur/referentTransfert", options)
.then((response) => {
return response;
})
.then(
(data) => {
console.log(data);
},
(error) => {
console.log(error);
}
);
}}
>
Envoyez
</Button>