feat: add auto_capture_at field within the invoice object (#34)

Co-authored-by: ProcessOut Fountain <internal@processout.com>

Author: roshan-gorasia-cko

lib/invoice.d.ts

@@ -237,6 +237,11 @@ declare class Invoice {
      * @type {boolean}
      */
     private verification;
+    /**
+     * A timestamp to indicate when an auto capture should take place following an authorization. This takes priority over the value sent in the authorization request.
+     * @type {string}
+     */
+    private autoCaptureAt;
     /**
      * Invoice constructor
      * @param {ProcessOut} client
@@ -855,6 +860,19 @@ declare class Invoice {
      * @return {Invoice}
      */
     setVerification(val: boolean): Invoice;
+    /**
+     * Get AutoCaptureAt
+     * A timestamp to indicate when an auto capture should take place following an authorization. This takes priority over the value sent in the authorization request.
+     * @return {string}
+     */
+    getAutoCaptureAt(): string;
+    /**
+     * Set AutoCaptureAt
+     * A timestamp to indicate when an auto capture should take place following an authorization. This takes priority over the value sent in the authorization request.
+     * @param {string} val
+     * @return {Invoice}
+     */
+    setAutoCaptureAt(val: string): Invoice;
     /**
      * Fills the current object with the new values pulled from the data
      * @param  {array} data