As you mentioned data frequency is very less (less changes in year) then you can pull data weekly(as you mentioned atmost once per week) from api and push to AEM crx via scheduler. Fix your cron job for weekly. Then you can use these data. There is no need to call api everytime. https://medium.com/@...

If client maynot agree then use querybuilder api to fetch path of matched property and do your operation.

Are you using aem as cloud or AEM-6.5.x ? Deploy accordingly for https://github.com/adobe/aem-guides-wknd    

You can create user https://adminconsole.adobe.com/ and provide dev instance access to this user. This user would receive an email, user can login and after that user would get sync to dev instance automatically. Then required ACL of your dev instance you can setup for this user.

Tools icon comes from below path: /libs/granite/ui/content/shell/start/content/cq/items/tabs/items/tools you can provide ACLs to restrict access to this path /libs/granite/ui/content/shell/start/content/cq/items/tabs/items/tools - sothat only users that are members of group that have permission to r...

We can't access aem/start.html on publish instance of like https://author-p<>-e<>.adobeaemcloud.com/aem/start.html. Publisher only serves the pages which are under /content hence above page can't be open at publish.

If bundle is not found at start level 20- you need to export these jars. embed required cif and magento jar in "all" module  <!-- Adobe CIF Dependencies --> <embedded> <groupId>com.adobe.commerce.cif</groupId> <artifactI...

Add store/ url required details in OSGI config - com.adobe.cq.commerce.graphql.client.impl.GraphqlClientImpl~<identifier>.cfg.json then create cloudconfig of the store view In AEM go to Tools -> Cloud Services -> CIF Configuration Select the commerce configuration you want to change Open the conf...

Make @Reference of OSGI class in your servlet and call respective method. Refer https://gist.github.com/nateyolles/d0a547d814376e66f7aa  

Adobe provides Bulk Import feature to move all assets from cloud(s3 and Azure blob) to AEM DAM. You can move all assets either to S3 or Azure Blob Storage and create metadata file for metadata info of all assets. Then create Bulk import configuration here- https://author-<p><e>.adobeaemcloud.com/mnt...