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<https://system.na0.netsuite.com/app/help/helpcenter.nl?fid=section_3978513526.html>

```A custom plug-in script can be any type of server-side SuiteScript other than a Mass Update script. Note that client-side SuiteScripts cannot act as custom plug-in scripts.```

i checked help center, any example or scenario's ?

any specific requirement where i can make use of this?

<https://system.na0.netsuite.com/app/help/helpcenter.nl?fid=chapter_3976781171.html>

```A custom plug-in is customizable functionality that is defined by an interface. When an interface is defined, third party solution providers can develop custom plug-in implementations and bundle them as part of a SuiteApp. After the SuiteApp is installed within an account, a solution implementer can define one or more alternate implementations. These implementations allow the solution implementer to customize the custom plug-in's logic to suit specific business needs.```

The basic answer is no, unless you are writing a suiteapp that you want others to customize

Okay, so the custom GL plugin , email plug in are completly different types

email capture is built on a ss1 custom plugin system

you have to implement different functions in each