> For the complete documentation index, see [llms.txt](https://guides.clickatell.com/flow/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guides.clickatell.com/flow/user-facing-nodes/input-nodes.md).

# Input nodes

*Input* nodes require some form of input from your customers.

The following *Input* nodes are available:

* [**Contact Receiving** ](/flow/user-facing-nodes/input-nodes/contact-receiving.md)- Request contact information from your customers and use the information as [variables ](broken://pages/-MiLNKY7ENp-stXfwsBb)in your workflow.
* [**OAuth Request**](/flow/user-facing-nodes/input-nodes/oauth-request.md) - Allows you to authenticate your customers securely against your chosen identity provider (IDP).
* [**Request input**](/flow/user-facing-nodes/input-nodes/menu-nodes-ask-for-input.md) - Ask customers to enter information (e.g., words, dates, numbers) that are saved as variables to be used later in the workflow.
* [**Send Form**](/flow/user-facing-nodes/input-nodes/send-form.md) - Create rich, multipage interactive forms for customers to complete on their mobile devices. *(Apple Messages for Business only)*
* [**Time Picker** ](/flow/user-facing-nodes/input-nodes/time-picker.md)- Allows a customer to select a slot from a list of available times, e.g., to make an appointment or schedule a delivery.  *(Apple Messages for Business only)*