Up to 8 attachments (including images) can be used with a maximum of 1.0 MB each and 10.5 MB total.
You don't need create AppKey and AppSecret . It is automatically generated in developer portal under the application you created just like below:
Up to 10 attachments (including images) can be used with a maximum of 1.0 MB each and 10.5 MB total.
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