Roamler is a market research app available on both IOS & Android.
The app lists a range of different fact-finding jobs/missions available within your local area.
In most cases, you act 'under cover'; the idea is not to announce that you are conducting a Roamler mission!
Select the job you wish to take from the list. Once you have accepted a task, you must complete it within a specific time frame (usually 2 hours), and the app will give you detailed instructions on what you are required to do.
This may be locating a specific product within a store environment, taking photos and answering questions asked of you by the app.
There may also be jobs where you have to interact with a staff member, be covert, and ask specific questions.
Jobs are generally pretty easy to carry out; you need to make sure you read what is expected of you before accepting the task; if you do it wrong, you won't be paid!
You can expect to earn anywhere between £2 and £10 for successful mission completion. Completed task payments are paid to your Paypal account.
This app requires you have an invite code to download and participate in tasks. The best place to find this code is to look at a Roamler Facebook page; they often list them there. They seem to restrict the number of new sign-ups at certain times and advertise the codes if they are expecting to be busy with lots of new tasks being made available.