Hello Nicolas,
you can use Web Services,
Please Refer :
Use the ServiceNow Table API to perform create, read, update, and delete (CRUD) operations on existing tables. This API is available starting with the Eureka release.
All URIs used by the Table API are relative to /api/. The URIs use the following formats:
- /api/now/table/(tableName)
- /api/now/v1/table/(tableName)
- /api/now/v1/table/(tableName)/(sys_id)
In these URIs:
- (tableName) is the table on which the action is performed.
- (sys_id) is the sys_id of the record on which the action is performed.
 | Note: The Getting Started with REST page provides a scenario-based example for using the Table API. |
Security
Access to tables via the REST API is restricted by BasicAuth and the rest_service role. ACLs defined for tables are enforced to restrict access to data.
To allow access to tables without any authentication and authorization, add the table name to sys_public.list. ACLs defined on tables are still enforced, and it is the customer's responsibility to deactivate ACLs on tables.
Table Access
All tables, including base system tables, global tables, and scoped tables are accessible via web services by default. You must fulfill any other web service security requirements, such as basic authentication and ACLs to access tables via web services.
You can control direct web service access to tables using the Allow access to this table via web services check box on the table Application Access settings. This check box must be selected to allow web service interaction with the table.
| Note: The application access fields controlling CRUD operations, such as Can read or Can create do not apply to web service requests. |
Method Summary
| HTTP Action + URI | Description |
|---|---|
| GET /api/now/v1/table/(tableName) | Retrieves records for the specified table. |
| POST /api/now/v1/table/(tableName) | Creates a record in the specified table. |
| GET /api/now/v1/table/(tableName)/(sys_id) | Retrieves the specified record from the specified table. |
| PUT /api/now/v1/table/(tableName)/(sys_id) | Updates the specified record with the request body. |
| PATCH /api/now/v1/table/(tableName)/(sys_id) | Updates the specified record with the request body. |
| DELETE /api/now/v1/table/(tableName)/(sys_id) | Deletes the specified record from the specified table. |
Using the REST API Explorer
Access the REST API Explorer by navigating to System Web Services > REST API Explorer.
The Request Headers and Path Parameters sections appear for all requests. Other sections may appear depending on the selected API and method.
The API and Method
The choice lists at the top of the REST API Explorer allow you to select an API, such as the Table API, Aggregate API, or Import Set API, and an API version.
Links that appear below these choice lists display available methods for the selected API and version, such as the GET method for the Table API. Each method includes a brief description of the action that method performs. The REST API Explorer displays a sample endpoint and certain Request Elements based on the selected API and method.
