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I am able to see a welcome message when I pass the credentials into a 'get' method. When I do a 'post' method, I get the invalid user login error. The Audit log shows only the 'get' calls and not the 'post' calls. Is there some authorization needed?

this doesnt sound like you are using soap

&lt;soap-env:Envelope xmlns:soap-env="<http://schemas.xmlsoap.org/soap/envelope/>"&gt;
  &lt;soap-env:Header&gt;
    &lt;tokenPassport&gt;
      &lt;account&gt;{{ACCOUNT}}&lt;/account&gt;
      &lt;consumerKey&gt;{{CONSUMER_KEY}}&lt;/consumerKey&gt;
      &lt;token&gt;{{TOKEN_ID}}&lt;/token&gt;
      &lt;nonce&gt;{{nonce}}&lt;/nonce&gt;
      &lt;timestamp&gt;{{timestamp}}&lt;/timestamp&gt;
      &lt;signature algorithm="HMAC-SHA256"&gt;{{signature}}&lt;/signature&gt;
    &lt;/tokenPassport&gt;
    &lt;preferences&gt;
      &lt;runServerSuiteScriptAndTriggerWorkflows&gt;
        false
      &lt;/runServerSuiteScriptAndTriggerWorkflows&gt;
    &lt;/preferences&gt;
    &lt;searchPreferences&gt;
      &lt;pageSize&gt;1000&lt;/pageSize&gt;
      &lt;bodyFieldsOnly&gt;false&lt;/bodyFieldsOnly&gt;
    &lt;/searchPreferences&gt;
  &lt;/soap-env:Header&gt;
  &lt;soap-env:Body&gt;
    &lt;get xmlns:xsi="<http://www.w3.org/2001/XMLSchema-instance>"
         xmlns:platformCore="urn:<http://core_2020_1.platform.webservices.netsuite.com|core_2020_1.platform.webservices.netsuite.com>"&gt;
      &lt;baseRef internalId="257" type="customList" xsi:type="platformCore:RecordRef"&gt;
        &lt;platformCore:name/&gt;
      &lt;/baseRef&gt;
    &lt;/get&gt;
  &lt;/soap-env:Body&gt;
&lt;/soap-env:Envelope&gt;

The URL I am using is <https://562XXXX-SB1.suitetalk.api.netsuite.com/services/NetSuitePort_2020_2>

How can I check the correct URL for the sandbox?

from the ui, you can use <https://system.na0.netsuite.com/app/common/otherlists/company.nl?selectedtab=companyurls|Company Information>

programatically is <https://system.na0.netsuite.com/app/help/helpcenter.nl?fid=section_n3494684.html|getDataCenterUrls>

the path of the url is basically what you have, although you probably want `/services/NetSuitePort_2020_1`  given that your platform core namespace is 2020_1

otherwise your body looks fine, so you should make sure that the environmental variables are correct and that your pre request scripts is setup correctly

it looks like you are using <https://www.zuar.com/blog/netsuite-api-exploring-soap/>, in which case i would double check that your code has been correctly updated to use HmacSHA256

Correct. The post uses SHA1 in their JS to generate the signature. Looks like the blog is not updated with the code to generate SHA256. Can you assist to check the code below

_let_ account = pm.environment.get("ACCOUNT");
_let_ consumerKey = pm.environment.get("CONSUMER_KEY");
_let_ consumerSecret = pm.environment.get("CONSUMER_SECRET");
_let_ tokenId = pm.environment.get("TOKEN_ID");
_let_ tokenSecret = pm.environment.get("TOKEN_SECRET");

_let_ timestamp = new Date().getTime().toString().substring(0, 10);
_let_ nonce = CryptoJS.lib.WordArray.random(10).toString();
_let_ baseString = `${account}&amp;${consumerKey}&amp;${tokenId}&amp;${nonce}&amp;${timestamp}`;
_let_ key = `${consumerSecret}&amp;${tokenSecret}`;
_let_ signature = CryptoJS.HmacSHA256(baseString, key).toString(CryptoJS.enc.Base64);

pm.environment.set("signature", signature);
pm.environment.set("nonce", nonce);
pm.environment.set("timestamp", timestamp);