diff --git a/packages/gitbeaker-core/src/services/Commits.ts b/packages/gitbeaker-core/src/services/Commits.ts
index c7d22369..a818dfe4 100644
--- a/packages/gitbeaker-core/src/services/Commits.ts
+++ b/packages/gitbeaker-core/src/services/Commits.ts
@@ -55,8 +55,8 @@ export interface CommitAction {
 }
 
 export interface GPGSignature {
-  signature_type: "PGP",
-  verification_status: "verified"|"unverified";
+  signature_type: 'PGP';
+  verification_status: 'verified' | 'unverified';
   gpg_key_id: number;
   gpg_key_primary_keyid: string;
   gpg_key_user_name: string;
@@ -66,8 +66,8 @@ export interface GPGSignature {
 }
 
 export interface X509Signature {
-  signature_type: "X509";
-  verification_status: "verified"|"unverified",
+  signature_type: 'X509';
+  verification_status: 'verified' | 'unverified';
   x509_certificate: {
     id: number;
     subject: string;
@@ -190,7 +190,11 @@ export class Commits extends BaseService {
     );
   }
 
-  signature(projectId: string | number, sha: string, options?: BaseRequestOptions): Promise<CommitSignature> {
+  signature(
+    projectId: string | number,
+    sha: string,
+    options?: BaseRequestOptions,
+  ): Promise<CommitSignature> {
     const pId = encodeURIComponent(projectId);
 
     return RequestHelper.get(
diff --git a/packages/gitbeaker-requester-utils/src/RequesterUtils.ts b/packages/gitbeaker-requester-utils/src/RequesterUtils.ts
index e069f360..25a1aa56 100644
--- a/packages/gitbeaker-requester-utils/src/RequesterUtils.ts
+++ b/packages/gitbeaker-requester-utils/src/RequesterUtils.ts
@@ -78,13 +78,13 @@ export function createRequesterFn(
   optionsHandler,
   requestHandler,
 ): (serviceOptions: DefaultServiceOptions) => RequesterType {
-  const requester: RequesterType = {} as RequesterType;
   const methods = ['get', 'post', 'put', 'delete', 'stream'];
 
   return (serviceOptions) => {
+    const requester: RequesterType = {} as RequesterType;
+
     methods.forEach((m) => {
-      /* eslint func-names:0 */
-      requester[m] = function (endpoint: string, options: Record<string, unknown>) {
+      requester[m] = (endpoint: string, options: Record<string, unknown>) => {
         const requestOptions = optionsHandler(serviceOptions, { ...options, method: m });
 
         return requestHandler(endpoint, requestOptions);
@@ -110,6 +110,7 @@ export function modifyServices<T>(services: T, customConfig: Record<string, unkn
 
   Object.entries(services).forEach(([k, s]) => {
     updated[k] = extendClass(s, customConfig);
+    if (k === 'GroupMembers') console.log(updated[k]);
   });
 
   return updated as T;
diff --git a/packages/gitbeaker-requester-utils/test/unit/RequesterUtils.ts b/packages/gitbeaker-requester-utils/test/unit/RequesterUtils.ts
index dbfc05b5..637f179d 100644
--- a/packages/gitbeaker-requester-utils/test/unit/RequesterUtils.ts
+++ b/packages/gitbeaker-requester-utils/test/unit/RequesterUtils.ts
@@ -1,6 +1,11 @@
 /* eslint-disable max-classes-per-file */
 import FormData from 'form-data';
-import { createRequesterFn, defaultOptionsHandler, modifyServices } from '../../src/RequesterUtils';
+import {
+  createRequesterFn,
+  defaultOptionsHandler,
+  modifyServices,
+  formatQuery,
+} from '../../src/RequesterUtils';
 
 const methods = ['get', 'put', 'delete', 'stream', 'post'];
 
@@ -53,6 +58,12 @@ describe('defaultOptionsHandler', () => {
     expect(headers.sudo).toBe('testsudo');
   });
 
+  it('should assign the prefixUrl property if passed', async () => {
+    const { prefixUrl } = defaultOptionsHandler(serviceOptions);
+
+    expect(prefixUrl).toBe('testurl');
+  });
+
   it('should default searchParams to an empty string if undefined', async () => {
     const { searchParams } = defaultOptionsHandler(serviceOptions, {
       query: undefined,
@@ -88,11 +99,11 @@ describe('createInstance', () => {
     requestTimeout: 50,
   };
 
-  it('should have a createInstance function', async () => {
+  it('should have a createInstance function', () => {
     expect(createRequesterFn).toBeFunction();
   });
 
-  it('should return an object with function names equal to those in the methods array when the createInstance function is called', async () => {
+  it('should return an object with function names equal to those in the methods array when the createInstance function is called', () => {
     const requester = createRequesterFn(optionsHandler, handler)(serviceOptions);
 
     expect(requester).toContainAllKeys(methods);
@@ -102,16 +113,44 @@ describe('createInstance', () => {
     });
   });
 
-  it('should call the handler with the correct endpoint when passed to any of the method functions', async () => {
+  it('should call the handler with the correct endpoint when passed to any of the method functions', () => {
     const testEndpoint = 'test endpoint';
     const requester = createRequesterFn(optionsHandler, handler)(serviceOptions);
 
     methods.forEach((m) => {
       requester[m](testEndpoint, {});
 
+      expect(optionsHandler).toBeCalledWith(serviceOptions, { method: m });
       expect(handler).toBeCalledWith(testEndpoint, {});
     });
   });
+
+  it('should respect the closure variables', () => {
+    const serviceOptions1 = {
+      headers: { test: '5' },
+      url: 'testurl',
+      rejectUnauthorized: false,
+      requestTimeout: 50,
+    };
+    const serviceOptions2 = {
+      headers: { test: '5' },
+      url: 'testurl2',
+      rejectUnauthorized: true,
+      requestTimeout: 100,
+    };
+
+    const requesterFn = createRequesterFn(optionsHandler, handler);
+    const requesterA = requesterFn(serviceOptions1);
+    const requesterB = requesterFn(serviceOptions2);
+
+    requesterA.get('test');
+
+    expect(optionsHandler).toBeCalledWith(serviceOptions1, { method: 'get' });
+
+    requesterB.get('test');
+
+    expect(optionsHandler).toBeCalledWith(serviceOptions2, { method: 'get' });
+  });
 });
 
 describe('modifyServices', () => {
@@ -205,3 +244,17 @@ describe('modifyServices', () => {
     expect(b.x).toBe(5);
   });
 });
+
+describe('formatQuery', () => {
+  it('should decamelize keys and stringify the object', async () => {
+    const string = formatQuery({ test: 6 });
+
+    expect(string).toBe('test=6');
+  });
+
+  it('should decamelize sub keys in not property and stringify the object', async () => {
+    const string = formatQuery({ test: 6, not: { test: 7 } });
+
+    expect(string).toBe('not=%7B%22test%22%3A7%7D&test=6');
+  });
+});