> For the complete documentation index, see [llms.txt](https://doc.sysdevmobile.com/mss-extensibility/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.sysdevmobile.com/mss-extensibility/mss-5.1/functions-kalipso-to-mss/customer.md).

# Customer

| Extension                                                                                                                              | Description                                                                                       |
| -------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------- |
| [EXT\_Customer\_Record](/mss-extensibility/mss-5.1/functions-kalipso-to-mss/customer/ext_customer_record.md)                           | Function to ask MSS to open MSS customer record screen.                                           |
| [EXT\_Customer\_Select](/mss-extensibility/mss-5.1/functions-kalipso-to-mss/customer/ext_customer_select.md)                           | Function to ask MSS to open the customer selection screen.                                        |
| [EXT\_Customer\_SelectContact](/mss-extensibility/mss-5.1/functions-kalipso-to-mss/customer/ext_customer_selectcontact.md)             | Function to ask MSS to open the MSS screen to select a customer contact.                          |
| [EXT\_Customer\_SelectDeliveryPlace](/mss-extensibility/mss-5.1/functions-kalipso-to-mss/customer/ext_customer_selectdeliveryplace.md) | Function to ask MSS to open the MSS screen to select a customer delivery place.                   |
| [EXT\_Customer\_ValidateNIF](/mss-extensibility/mss-5.1/functions-kalipso-to-mss/customer/ext_customer_validatenif.md)                 | Function to ask MSS to validate a customer fiscal number (only valid for Portugal fiscal numbers) |
| [EXT\_Customer\_New](/mss-extensibility/mss-5.1/functions-kalipso-to-mss/customer/ext_customer_new.md)                                 | Function to create a new customer                                                                 |
| [EXT\_Customer\_Edit](/mss-extensibility/mss-5.1/functions-kalipso-to-mss/customer/ext_customer_edit.md)                               | Function to edit a customer record                                                                |