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Hi, is it possibile, with REST API (<https://system.netsuite.com/help/helpcenter/en_US/APIs/REST_API_Browser/record/v1/2023.1/index.html#/definitions/invoice>) to get the invoices (using GET /invoices) by customer id?
If yes, is there a way to download the pdf of a specific invoice or to get the link of it?

your first question is an application of <https://system.na0.netsuite.com/app/help/helpcenter.nl?fid=chapter_1540810947.html|Record Filtering and Query> on the entity field

for the second, rest web services offer no way to print records

is there any other way to get invoice pdf, via web?

typically you want to use the email functionality built into netsuite to email the transactions

if you really want the invoice pdf, then you need to use SuiteScript and the <https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4412042824.html|N/render> to generate the pdf

at which point you can save it in the file cabinet to retrieve later, or you could write it to the response of a <https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4387799600.html|suitelet> or <https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4387799403.html|restlet>

you can download the file using the <https://system.netsuite.com/app/help/helpcenter.nl?fid=section_N3488543.html|get> operation from the soap web services

suitelets suffer from being public urls that arent authenticated

restlets suffer the same problem as soap web services, you will be forced to write base 64 contents

I dont understand. So, can't i save it in a cabinet and retrieve via rest api?