Web-payment-sdk got error when creating a payment

Questions
3

I tried to use a workaround I saw in this conversation Passing a variable as BigInt to create a new order - #3 by josh-square

BigInt.prototype.toJSON = function() {
  return this.toString(); 
};

...
try {
        const response = await squareClient.payments.create({
        idempotencyKey: randomUUID(),
        sourceId: appointmentId,
        name: appointmentId,
        amountMoney: {
            currency: "CAD",
            amount: BigInt(3000),
        },
        });
        console.log('result:::', response)
        return response;
    } catch (error) {
        console.log(error);
    }
...

but still got another error as below

statusCode: 400,
body: { errors: [ [Object] ] },
errors: [
{
code: ‘EXPECTED_INTEGER’,
detail: ‘Expected an integer value (line 1, character 140)’,
field: ‘amount_money.amount’,
category: ‘INVALID_REQUEST_ERROR’
}
]
}

My version “square”: “^43.0.1”,

Appreciate if someone can help. Thanks!