Simply put, connectors are sets of API questions (or queries, to be precise) to the different marketing platforms asking for the provision of different datasets. If everything is according to the rules, then the platform provides us with the requested data and we store it in the supported destinations.
Connector Templates are made to make your life easier by downloading predefined sets of marketing data as a report. Templates use automated queries in JSON to download your data.
What do connectors actually download? Well, it varies from platform to platform but usually they download attributes of your data called Dimensions and quantitative measurements called Metric:
From dimensions: Date, Campaign Name, Ad Group Name(optional)
From metrics: Impressions, Clicks, Conversions, Conversion Value
If you would like to add some additional dimensions or metrics for your customised template, follow next tutorial in this thread for more explanation.
Every ROIVENUE's Connector Template is created in JSON language and that is why it is important to you.