I am new to work on AEM Forms, I have the usecase to prefill form fields, some fields from a rest service call, can you please provide me some link which explains how to do this, also I am using AEM 6.3 forms, so have to use features of AEM 6.3 forms only, not the traditional ways to prefill data.
Thanks for your response
Please refer to following document:
You may want to see 'AEM Forms prefill service' section in it.
We have also introduced Data Integrations in this release, please do check : https://helpx.adobe.com/aem-forms/6-3/data-integration.html