Begin by exporting the data you wish to move from your cart system. Most cart systems provide options to export data in various formats such as CSV, JSON, or XML. Choose a format that is compatible with Snowflake and meets your data needs. Ensure the exported file contains all necessary data fields required for analysis or reporting.

Before uploading to Snowflake, you may need to clean or transform the data to match the schema of your Snowflake tables. This might involve formatting dates, normalizing text fields, or restructuring JSON objects. Use a scripting language like Python or a spreadsheet application to make necessary adjustments.

In Snowflake, a stage is a location where data files are stored before being loaded into tables. Create an internal stage in your Snowflake account using the SQL command:
```
CREATE STAGE my_stage;
```
This stage will temporarily hold your data files before they are loaded into tables.

Use the Snowflake web interface or SnowSQL (Snowflake's command-line client) to upload your data file to the stage you created. If using SnowSQL, the command might look like:
```
PUT file://path_to_your_file/my_data.csv @my_stage;
```
Ensure your file path and stage name are correct.

If not already created, define a table in Snowflake where the data will be loaded. Use a CREATE TABLE statement to define the schema. For example:
```sql
CREATE TABLE my_table (
id INTEGER,
product_name STRING,
price FLOAT,
quantity INTEGER
);
```
Adjust the column names and data types to match your data file.

Use the COPY INTO command in Snowflake to load the data from your stage into the target table. Ensure you specify the correct stage, table, and file format. For a CSV file, the command might look like:
```sql
COPY INTO my_table
FROM @my_stage/my_data.csv
FILE_FORMAT = (TYPE = 'CSV' FIELD_OPTIONALLY_ENCLOSED_BY = '"' SKIP_HEADER = 1);
```
Adjust file format options based on your file structure.

After loading the data, run a few queries to verify the data is correctly loaded into the table. Check for any discrepancies or issues. Once satisfied, clean up by removing the data file from the stage to save storage space:
```sql
REMOVE @my_stage;
```
This step ensures your Snowflake environment remains organized and efficient.

By following these steps, you can successfully transfer data from your cart system into Snowflake without the need for third-party connectors or integrations.