# Authentication
### Start Development
You will get **"Partner Key"** for using authentication via your email after we approve your application.
### Retrieve Application Key and Application Secret
1. Redirect to Authentication URL with Post method.
```
// Example Form
partnersecretkey :
token :
returnurl :
```
2\. The system will redirect to returnurl after users login successfully with Post method and key parameters. (storename, apikey, apisecret)
## Callback URL
`POST` `{returnurl}`
#### Query Parameters
| Name | Type | Description |
| ---------------------------------------- | ------ | -------------------------- |
| token1\* | String | storename |
| token2\* | String | apikey |
| token3\* | String | apisecret |
| token4 | String | Account name |
| token5\* | String | Your token (reference key) |