https://docs.whmcs.com/9-1/tags/whmcs-api/Recent content in whmcs-api onHugo -- gohugo.iohttps://docs.whmcs.com/9-1/troubleshooting/troubleshoot-customizations/troubleshooting-customizations/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/troubleshooting/troubleshoot-customizations/troubleshooting-customizations/Links to dedicated troubleshooting pages for hooks, order form templates, system themes, and WHMCS API calls, and lists common issue links for order-form-template and system-theme problems via the troubleshooting-links shortcode.https://docs.whmcs.com/9-1/troubleshooting/troubleshoot-customizations/troubleshooting-whmcs-api-calls/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/troubleshooting/troubleshoot-customizations/troubleshooting-whmcs-api-calls/Provides a sample localAPI() GetUsers request and JSON response for verifying custom API code, and shows how to enable transactional API debugging by adding $api_enable_logging = true to configuration.php, which logs data to the tblapilog database table.https://docs.whmcs.com/9-1/system/authentication/api-credentials/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/system/authentication/api-credentials/Details the steps to create, edit, and delete API roles and API credential pairs at Configuration > System Settings > Manage API Credentials, including generating identifier/secret pairs and assigning permission roles to a credential.https://docs.whmcs.com/9-1/admins/notifications/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/admins/notifications/Covers configuring Slack and Email notification providers, creating notification rules with events and conditions, enabling/editing/duplicating/deleting rules, and self-hosted customization using the NotificationPreSend hook and the TriggerNotificationEvent API function for custom events.https://docs.whmcs.com/9-1/installation-guide/set-up-a-test-environment/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/installation-guide/set-up-a-test-environment/Walks through creating a WHMCS test environment: getting a development license, duplicating the installation and database, password-protecting the directory, updating the System URL, disabling email sending, and truncating client data tables before going live.https://docs.whmcs.com/9-1/system/authentication/openid-connect/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/system/authentication/openid-connect/Covers generating and resetting OAuth Client API Credentials and authorized redirect URIs at Utilities > System > OpenID Connect, and gives the full step-by-step setup to let cPanel & WHM users log in via WHMCS External Authentication, including the Well Known Config URI and SSL requirements.https://docs.whmcs.com/9-1/system/authentication/openid-connect-development/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/system/authentication/openid-connect-development/Documents the developer workflow for OpenID Connect authentication against WHMCS: the .htaccess rewrite rule for the discovery document, the client_id/response_type/scope/redirect_uri/state authentication request parameters, exchanging the authorization code for access_token and id_token, and the iss/sub/aud/iat/exp ID token claims.https://docs.whmcs.com/9-1/troubleshooting/troubleshoot-licensing/invalid-license-api-errors/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/troubleshooting/troubleshoot-licensing/invalid-license-api-errors/Explains that the Your license key is invalid API error occurs when a license check runs from a non-web context like a CLI script or cron with a mismatched outbound IP, with steps to confirm the context, calling method, and IP mismatch, and recommending remote HTTP requests to api.php instead of the localAPI helper.https://docs.whmcs.com/9-1/troubleshooting/troubleshoot-email/sendemail-sending-failure/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/troubleshooting/troubleshoot-email/sendemail-sending-failure/Lists which email template types the SendEmail API command supports (General, Invoice, Support, Product, Domain, Affiliate) versus unsupported types (User, Invite, Notification, Admin) that trigger a “Sending Failed. Please see documentation.” error, and gives steps to recreate the template as a supported type and update the messagename parameter.