diff --git a/src/core/authorizenet-base.ts b/src/core/authorizenet-base.ts
index 924e9e8..75efa37 100644
--- a/src/core/authorizenet-base.ts
+++ b/src/core/authorizenet-base.ts
@@ -46,8 +46,12 @@ abstract class AuthorizenetBase extends AbstractPaymentProvider {
     this.options_ = options;
     this.logger = container.logger as Logger;
     this.container_ = container;
+    // Accept both the correct 'environment' key and the legacy misspelled
+    // 'enviornment' (see #1) so existing configs keep working.
+    const envOption =
+      this.options_.environment ?? this.options_.enviornment;
     this.solutionID =
-      this.options_.enviornment === "production" ? "AAA201051" : "AAA198606";
+      envOption === "production" ? "AAA201051" : "AAA198606";
   }
 
   static validateOptions(options: AuthorizenetOptions): void {
@@ -91,7 +95,10 @@ abstract class AuthorizenetBase extends AbstractPaymentProvider {
   }
   // START GENAI
   private getEnvironment() {
-    return this.options_.enviornment === "production"
+    // Accept both 'environment' and the legacy misspelling 'enviornment' (#1).
+    const envOption =
+      this.options_.environment ?? this.options_.enviornment;
+    return envOption === "production"
       ? Constants.endpoint.production
       : Constants.endpoint.sandbox;
   }
diff --git a/src/types/index.ts b/src/types/index.ts
index e97cff7..20511ff 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -39,6 +39,11 @@ export interface Options {
   api_login_id: string;
   transaction_key: string;
   capture?: boolean;
+  environment?: string;
+  /**
+   * @deprecated Typo preserved for backward compatibility. Use `environment`.
+   *             Will be removed in a future major version.
+   */
   enviornment?: string;
 }