diff --git a/examples/general/permissions.ts b/examples/general/permissions.ts
index 04775b0..24d01bb 100644
--- a/examples/general/permissions.ts
+++ b/examples/general/permissions.ts
@@ -15,6 +15,6 @@ permissionsClient.getResources()
 
     return permissionsClient.bulkPermissionsUpdate(5142, [
       {resourceId: '3281', resourceType: 'account', accessLevel: 'viewer'},
-      {resourceId: '3809', resourceType: 'inbox', destroy: 'true'}
+      {resourceId: '3809', resourceType: 'inbox', destroy: true}
     ])
   })
diff --git a/src/__tests__/lib/api/resources/Permissions.test.ts b/src/__tests__/lib/api/resources/Permissions.test.ts
index 3b50779..204b4d2 100644
--- a/src/__tests__/lib/api/resources/Permissions.test.ts
+++ b/src/__tests__/lib/api/resources/Permissions.test.ts
@@ -63,11 +63,11 @@ describe("lib/api/resources/Permissions: ", () => {
         {
           resourceId: "3809",
           resourceType: "inbox",
-          _destroy: "true",
+          destroy: true,
         },
       ];
 
-      expect.assertions(2);
+      expect.assertions(3);
 
       mock.onPut(endpoint).reply(200, expectedResponseData);
       const result = await permissionsAPI.bulkPermissionsUpdate(
@@ -76,6 +76,20 @@ describe("lib/api/resources/Permissions: ", () => {
       );
 
       expect(mock.history.put[0].url).toEqual(endpoint);
+      expect(JSON.parse(mock.history.put[0].data)).toEqual({
+        permissions: [
+          {
+            resource_id: "3281",
+            resource_type: "account",
+            access_level: "viewer",
+          },
+          {
+            resource_id: "3809",
+            resource_type: "inbox",
+            _destroy: true,
+          },
+        ],
+      });
       expect(result).toEqual(expectedResponseData);
     });
 
@@ -93,7 +107,7 @@ describe("lib/api/resources/Permissions: ", () => {
         },
       ];
 
-      expect.assertions(2);
+      expect.assertions(3);
 
       mock.onPut(endpoint).reply(200, expectedResponseData);
       const result = await permissionsAPI.bulkPermissionsUpdate(
@@ -102,6 +116,12 @@ describe("lib/api/resources/Permissions: ", () => {
       );
 
       expect(mock.history.put[0].url).toEqual(endpoint);
+      expect(JSON.parse(mock.history.put[0].data)).toEqual({
+        permissions: [
+          { resource_id: "3281", resource_type: "account" },
+          { resource_id: "3809", resource_type: "inbox" },
+        ],
+      });
       expect(result).toEqual(expectedResponseData);
     });
 
diff --git a/src/lib/api/resources/Permissions.ts b/src/lib/api/resources/Permissions.ts
index eb17aa9..4829da9 100644
--- a/src/lib/api/resources/Permissions.ts
+++ b/src/lib/api/resources/Permissions.ts
@@ -37,11 +37,9 @@ export default class PermissionsApi {
 
     const flattenPermissionObjects = permissions.map((permission) => ({
       resource_id: permission.resourceId,
-      resourceType: permission.resourceType,
-      ...(permission.accessLevel && { accessLevel: permission.accessLevel }),
-      // @ts-ignore
-      // eslint-disable-next-line no-underscore-dangle
-      ...(permission._destroy && { _destroy: permission.destroy }),
+      resource_type: permission.resourceType,
+      ...(permission.accessLevel && { access_level: permission.accessLevel }),
+      ...(permission.destroy && { _destroy: permission.destroy }),
     }));
     const body = { permissions: flattenPermissionObjects };
 
diff --git a/src/types/api/permissions.ts b/src/types/api/permissions.ts
index 646aa7e..d6e9545 100644
--- a/src/types/api/permissions.ts
+++ b/src/types/api/permissions.ts
@@ -10,5 +10,5 @@ export type PermissionResourceParams = {
   resourceId: string;
   resourceType: string;
   accessLevel?: string;
-  destroy?: string;
+  destroy?: boolean;
 };