Unable to add fields to Hosted feature Service using REST call

[SreedharBalerao]

I am new developer to ESRI AGOL,

I am able to

1) Upload ShapeFile

2) Publish ShapeFile as a HostedService

Now I need to add few extra fields to the featureService layer.

I tried to post fields collection to

/addToDefinition end point,

response is Success, but when I check the featureService layer in AGOL portal, I do not see the newly added fields

Any suggestions please

[SreedharBalerao]

Any Suggestions please? Bumping it

[SzymonPiskula1]

Perhaps you got the syntax of /addToDefinition wrong and the field should be somehow differently nested in your JSON payload? Different array/attribute name. Deeper in the payload tree etc?

[SarahScott3]

Can you tell me a little bit more about your workflow? 

What does the JSON you're using in the addToDefinition look like?