Connecting to Epicor ERP

To successfully connect to your ERP instance, you must specify the following connection properties:

• Url, set this to the url of the server hosting your ERP instance. For example, https://myserver.EpicorSaaS.com
• ERPInstance, set this to the name of your ERP instance.
• User, set this to the username of your account.
• Password, set this to the password of your account.
• Service, set this to the service you want to retrieve data from. For example, BaqSvc.

In addition, you may also set the optional connection properties:

• ApiKey, An optional key that may be required for connection to some services depending on your account configuration.
• ApiVersion, Defaults to v1. May be set to v2 to use the newer Epicor API.
• Company, Required if you set the ApiVersion to v2.

Authenticating to Epicor ERP

OpenID with AzureAD

OpenID Connect with Azure AD is a connection type that goes through OAuth. Set the AuthScheme to AzureADOpenID. The following sections assume that you have done so.

Desktop Applications

Follow the steps below to authenticate with the credentials for a custom OAuth app. See Creating an Azure AD Application. Get an OAuth Access Token

You are ready to connect after setting one of the below connection properties groups depending on the authentication type.

1. Authenticating using a Client Secret
   • OAuthClientId: Set this to the Client Id in your app settings.
   • OAuthClientSecret: Set this to the Client Secret in your app settings.
   • CallbackURL: Set this to the Redirect URL in your app settings.
   • InitiateOAuth: Set this to GETANDREFRESH. You can use InitiateOAuth to avoid repeating the OAuth exchange and manually setting the OAuthAccessToken. .
2. Authenticating using a Certificate
   • OAuthClientId: Set this to the Client Id in your app settings.
   • OAuthJWTCert: Set this to the JWT Certificate store.
   • OAuthJWTCertType: Set this to the type of the certificate store specified by OAuthJWTCert.
   • CallbackURL: Set this to the Redirect URL in your app settings.
   • InitiateOAuth: Set this to GETANDREFRESH. You can use InitiateOAuth to avoid repeating the OAuth exchange and manually setting the OAuthAccessToken. .

When you connect the adapter opens the OAuth endpoint in your default browser. Log in and grant permissions to the application. The adapter then completes the OAuth process:

1. Extracts the access token from the callback URL and authenticates requests.
2. Obtains a new access token when the old one expires.
3. Saves OAuth values in OAuthSettingsLocation to be persisted across connections.

Web Applications

When connecting via a Web application, you need to register a custom OAuth app with Epicor ERP. See Creating an Azure AD Application. You can then use the adapter to get and manage the OAuth token values. Get an OAuth Access Token

Set one of the following connection properties groups depending on the authentication type to obtain the OAuthAccessToken:

1. Authenticating using a Client Secret
   • OAuthClientId: Set this to the client Id in your app settings.
   • OAuthClientSecret: Set this to the client secret in your app settings.
2. Authenticating using a Certificate
   • OAuthClientId: Set this to the client Id in your app settings.
   • OAuthJWTCert: Set this to the JWT Certificate store.
   • OAuthJWTCertType: Set this to the type of the certificate store specified by OAuthJWTCert.

You can then call stored procedures to complete the OAuth exchange:

1. Call the GetOAuthAuthorizationURL stored procedure. Set the AuthMode input to WEB and set the CallbackURL input to the Redirect URI you specified in your app settings. If necessary, set the Permissions parameter to request custom permissions.

   The stored procedure returns the URL to the OAuth endpoint.

2. Open the URL, log in, and authorize the application. You are redirected back to the callback URL.
3. Call the GetOAuthAccessToken stored procedure. Set the AuthMode input to WEB. Set the Verifier input to the "code" parameter in the query string of the callback URL. If necessary, set the Permissions parameter to request custom permissions.

To connect to data, set the OAuthAccessToken connection property to the access token returned by the stored procedure. When the access token expires after ExpiresIn seconds, call GetOAuthAccessToken again to obtain a new access token.

Headless Machines

To configure the driver to use OAuth with a user account on a headless machine, you need to authenticate on another device that has an internet browser.

1. Choose one of these two options:
   • Option 1: Obtain the OAuthVerifier value as described in "Obtain and Exchange a Verifier Code" below.
   • Option 2: Install the adapter on another machine and transfer the OAuth authentication values after you authenticate through the usual browser-based flow, as described in "Transfer OAuth Settings" below.

2. Then configure the adapter to automatically refresh the access token from the headless machine.

Option 1: Obtain and Exchange a Verifier Code

To obtain a verifier code, you must authenticate at the OAuth authorization URL.

Follow the steps below to authenticate from the machine with an internet browser and obtain the OAuthVerifier connection property.

1. Choose one of these options:
   • If you are using the Embedded OAuth Application click Epicor ERP OAuth endpoint to open the endpoint in your browser.
   • If you are using a custom OAuth application, create the Authorization URL by setting the following properties:
     • InitiateOAuth: Set to OFF.
     • OAuthClientId: Set to the client Id assigned when you registered your application.
     • OAuthClientSecret: Set to the client secret assigned when you registered your application.
     Then call the GetOAuthAuthorizationURL stored procedure with the appropriate CallbackURL. Open the URL returned by the stored procedure in a browser.

2. Log in and grant permissions to the adapter. You are then redirected to the callback URL, which contains the verifier code.
3. Save the value of the verifier code. Later you will set this in the OAuthVerifier connection property.

Next, you need to exchange the OAuth verifier code for OAuth refresh and access tokens. Set the following properties:

On the headless machine, set the following connection properties to obtain the OAuth authentication values:

• InitiateOAuth: Set this to REFRESH.
• OAuthVerifier: Set this to the verifier code.
• OAuthClientId: (custom applications only) Set this to the client Id in your custom OAuth application settings.
• OAuthClientSecret: (custom applications only) Set this to the client secret in the custom OAuth application settings.
• OAuthSettingsLocation: Set this to the location of the file where the driver saves the OAuth token values that persist across connections.

After the OAuth settings file is generated, you need to re-set the following properties to connect:

• InitiateOAuth: Set this to REFRESH.
• OAuthClientId: (custom applications only) Set this to the client Id assigned when you registered your application.
• OAuthClientSecret: (custom applications only) Set this to the client secret assigned when you registered your application.
• OAuthSettingsLocation: Set this to the location containing the encrypted OAuth authentication values. Make sure this location grants read and write permissions to the adapter to enable the automatic refreshing of the access token.

Option 2: Transfer OAuth Settings

Prior to connecting on a headless machine, you need to create and install a connection with the driver on a device that supports an internet browser. Set the connection properties as described in "Desktop Applications" above.

After completing the instructions in "Desktop Applications", the resulting authentication values are encrypted and written to the location specified by OAuthSettingsLocation. The default filename is OAuthSettings.txt.

Once you have successfully tested the connection, copy the OAuth settings file to your headless machine.

On the headless machine, set the following connection properties to connect to data:

• InitiateOAuth: Set this to REFRESH.
• OAuthClientId: (custom applications only) Set this to the client Id assigned when you registered your application.
• OAuthClientSecret: (custom applications only) Set this to the client secret assigned when you registered your application.
• OAuthSettingsLocation: Set this to the location of your OAuth settings file. Make sure this location gives read and write permissions to the adapter to enable the automatic refreshing of the access token.