Error when trying to save card created with Core Methods token

[Oteiza-a]

Hello, we are implementing the "Core Methods" integration at our checkout (documentation) , and we have successfully been able to generate the card token through the mp.fields.createCardToken function.

Here is an example of the request generated from our frontend by the createCardToken function:

The response:

After that, we wanted to save this card, as shown in this documentation, with the mercadopago.card.create function, but we were getting this error, even though the token and the customer_id were being sent correctly:

So then we tried sending the payment_method_id, and the issuer_id, as suggested by the documentation, but now we are getting this error:

We have checked many times that everything is sent correctly, yet we keep getting that error. We have tried tokens generated with the documentation's test cards and with real cards and real names, yet the result is the same.

[lucmantovani]

Hello @Oteiza-a!

Which version of SDK NodeJS are you using?
Also, could you send the snippet you are using to save the card?

[Oteiza-a]

Hi @lucmantovani, thank you for responding.

In the frontend we are using the V2 of the sdk, we are loading the script via https://sdk.mercadopago.com/js/v2, and in the backend we are using the "mercadopago" library, with the "^1.5.12" version.

Here is a snippet of our backend code getting the customer, and sending it with the rest of the data to the create card function:

async const saveCard(
  cardInfo: SaveCardRequestDto,
  customerEmail: string,
): Promise<CommonCardResponse> {
  const { cardToken, paymentMethodId, issuerId } = cardInfo

  const mpCustomerSearch = await MercadoPago.customers.search({ qs: { email: customerEmail } })
  let mpCustomer = mpCustomerSearch?.results?.find((customer) => customer.email === customerEmail)

  if (!mpCustomer) {
    mpCustomer = await MercadoPago.customers.create({ email: customerEmail })
  }

  const createCardPayload: CreateCardRequestDTO = { 
    token: cardToken, 
    customer_id: mpCustomer.id,
    payment_method_id: paymentMethodId,
    issuer_id: issuerId
  }
  this.logger.info('request from mp', createCardPayload)
  const newCard = await MercadoPago.card.create(createCardPayload);

  // ...
}

It is worth noting too that we were already creating and saving cards before integrating the Core Methods in the frontend.

[lucmantovani]

What do you mean by "Before implementing the Core Methods"?
How were you creating the token before?

[Oteiza-a]

We used to generate the card token with the sdk function mp.createCardToken, sending the card data directly, as seen in this documentation

[lucmantovani]

Oh, I see!
Well, even though now you are using fields (which is correct!) the token creation should not be the problem here

Have you tried creating the token as usual and then saving the card directly calling the API?

[Oteiza-a]

@lucmantovani i finally found what the problem was, we were using an old MercadoPago API key in the frontend, i changed it for the new one and it worked. Sorry for making unrelated questions, but it was hard for me to identify the origin of the error.

Thanks a lot for your help!

[lucmantovani]

No problem!
Glad it worked!