Custom connector FAQ for Azure Logic Apps, Power Automate, and Power Apps
Note
This topic is part of a tutorial series on creating and using custom connectors in Azure Logic Apps, Power Automate, and Power Apps. Make sure you read the custom connector overview to understand the process.
Requirements
Q: Can I build a connector without REST APIs? A: For Power Apps and Power Automate, you must support stable HTTP REST APIs for your service. For Logic Apps, you also have the option of using a SOAP API.
Q: What tools can I use to expose an API? A: Azure has capabilities and services that you can use for exposing any service as an API, such as Azure App Service for hosting, API Management, and more.
Q: What authentication types are supported? A: You can use these supported authentication standards:
- OAuth 2.0 for specific services, including Azure Active Directory, Facebook, Dropbox, GitHub, and SalesForce
- Generic OAuth 2.0
- Basic authentication
- API Key
Limits
Q: What are the limits for connectors and API requests? A: The following tables show the limits:
| Azure Logic Apps | Limit |
|---|---|
| Number of custom connectors that you can create | 1,000 per Azure subscription |
| Number of requests per minute for each connection created by a custom connector | 500 requests for each connection created by the connector |
| Power Automate and Power Apps | Limit |
|---|---|
| Number of custom connectors that you can create | Free plan: one1 Office 365 and Dynamics 365 plans: one Plan 1 and Plan 2: unlimited |
| Number of requests per minute for each connection created by a custom connector | 500 requests for each connection created by the connector |
1 The free plan doesn’t allow you to share connections or custom connectors with other people in your company.
If you use an OpenAPI definition or Postman collection to describe a custom connector, the file must be less than 1 MB.
Q: What are the size limits for connectors and operations through a gateway? A: The limits can be found in the gateway documentation.
Triggers
Q: Can I build triggers without webhooks? A: Custom connectors for Azure Logic Apps and Power Automate support webhook-based and polling triggers. Webhook-based triggers wait for an event to occur, while polling triggers call your service at a specified frequency to check for new data. If you want to request other patterns for implementation, contact condevhelp@microsoft.com with more details about your API.
Other
Q: My APIs use a dynamic host. How do I implement them with OpenAPI? A: Policy Templates can be used to dynamically modify the host at runtime. See the Set Host URL policy for more information.
Q: Do you support Postman Collection V2? A: No, only Postman Collection V1 is currently supported.
Q: Do you support OpenAPI 3.0? A: No, only OpenAPI 2.0 is currently supported.
Q: Is a developer plan available to use for my connector development efforts? A: Yes, the Power Apps Community Plan is available for use and is free for Power Apps and Power Automate.