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You can create following two types of App Templates:
Create an Inbound Template to receive helps in receiving data from the Partner. In this Template, your Partner will define defines the Source application account and configuration details. Create an Outbound Template to send with configuration details and Company defines the configuration for the destination.
Outbound Template helps in sending data to the Partner. In In this Template, Company will define defines the Source application account and configuration detailswith configuration details and your Partner defines the configuration for the destination.