Hello ktpsns! Many thanks for your feedback on https://developer.ing.com/. For the moment, the "Account Information API" is indeed only available to companies with a PSD2 license.
But, there are discussions to open the API to individuals so they can programmatically consult their accounts only.
Do not hesitate to post this question/request as a suggestion on the website, https://developer.ing.com/openbanking/support