To solve your case, we need you to do the following:
You must check that the Web Code (CCLW) you are using is from your Live account and in the configuration you do not have the "Enable sandbox" or "Test" option configured.
Our system uses different credentials per environment, remember that the test credentials can be found at https://demo.paguelofacil.com, and you must have the sandbox option enabled.
All our eCommerce integrations can perform test transactions, except Shopify and WIX. You should also take into account that the payment methods PagoCash and Nequi, by their nature, do not allow test transactions.
If you wish to process real transactions instead, you cannot enable the sandbox in your plugin configuration. You must use your production credentials. https://comercios.paguelofacil.com
In both environments, the credentials are located at:
Your profile -> My Merchant -> Keys