# 10730 (/api/nvp-soap/troubleshooting/10730)



Returns from the following `NVP/SOAP` APIs:

* `DoAuthorization`
* `DoDirectPayment`
* `DoExpressCheckoutPayment`
* `DoReferenceTransaction`
* `DoUATPExpressCheckoutPayment`
* `SetExpressCheckout`
* `UpdateAuthorization`

## Cause [#cause]

The API request includes a missing, incorrect, or invalid postal code.

## Impact [#impact]

The payment process is halted, preventing the customer from finalizing their purchase. This can lead to a poor customer experience and potentially lost sales if the issue is not resolved promptly.

## Resolution [#resolution]

* Verify the postal code in the API request. If the postal code comes from the customer, surface the error to the customer to provide the correct postal code.
* The [postal code field](/api/nvp-soap/do-express-checkout-payment-nvp/#address-type-fields) (ZIP code in the US) is `PAYMENTREQUEST_n_SHIPTOZIP`.
* Retry the API request with the correct postal code.
* Implement address validation on the merchant website before submitting the request to PayPal.

## Upgrade [#upgrade]

The NVP/SOAP API integration method is deprecated. You can find more information about our latest integrations from the following resources:

* [REST APIs](/api/rest/)
* [PayPal Checkout](/api/rest/integration/orders-api/api-use-cases/standard/)
* [PayPal Developer homepage](/)

## Additional resources [#additional-resources]

* [Express checkout token](/api/nvp-soap/set-express-checkout-soap/)
* [NVP/SOAP integration](/archive/express-checkout)
* [NVP/SOAP error codes](/api/nvp-soap/errors/)

> **Info:** You can reach out for support at [paypal-techsupport.com](http://www.paypal-techsupport.com).