Apple has ended a multi-day row with Facebook and Google over their controversial spy apps. The Silicon Valley giant restored Google and Facebook's enterprise certificates late Thursday, which brings an end to its ban on the company's internal mobile apps. The ban left many employees unable to test early versions of software, or complete mundane tasks like book a shuttle to get around campus. Many said Google and Facebook's offices were left in a state of disarray after their app permissions were revoked for less than 24 hours. Scroll down for video Apple restored Google and Facebook's enterprise certificates late Thursday, which brings an end to a ban on internal mobile apps. Many said the move caused internal disarray at the firms THE DATA FACEBOOK COLLECTED FROM TEENAGERS AS YOUNG AS 13 Users who 'consented' to take part in the program were instructed to download a 'Research VPN' app. The app was previously referred to as 'Onavo VPN.' After downloading the app, it showed a warning saying downloading the app would 'allow any app from this enterprise developer' to be used on your iPhone and may allow access to your data.' But what it didn't explicitly say was that the app would collect all of their phone and website activity. In addition, it would track what apps they downloaded, when they used them and what they do on them. Earlier this week, Apple moved to temporarily ban Facebook and Google's developer permissions after both were found to be skirting the App Store's data collection policies. Facebook and Google took advantage of Apple's enterprise certificate, which allows companies to test iPhone apps without going through the company's typical app review process. Both companies claimed they did this to collect research on users' activity through an app sideloaded onto their mobile phone, as well as other devices. However, the 'research' apps weren't supposed to be distributed using Apple's enterprise certificates, so Apple pulled their permissions, saying the apps had broken its rules. Facebook was running a 'Research VPN' app downloaded by volunteers, some of which were teenagers as young as 13, and paying them $20 in exchange for tracking all of their phone and web activity. Among the data collected from teens by the app was all of their phone and web activity, information on apps they installed, when they used them and what they did on them. Google, meanwhile, had been quietly running a data collecting app called Screenwise Meter that pays users if they agree to have their activity tracked by the tech giant. Facebook has admitted to paying young people to install a 'social media research' app which monitors their web activity, according to reports. Apple banned the app, formerly known as Onavo VPN, from the app store because it violated its data collection policies After downloading the app, it showed a warning saying downloading the app would 'allow any app from this enterprise developer' to be used on your iPhone and may allow access to your data.' But it didn't explicitly say that it would collect all of their phone and web activity HOW DOES GOOGLE'S SHADY 'RESEARCH APP' WORK? Users sign up on the Opinion Rewards program website. Google will send volunteers easy-to-install meters that track TV and router usage. Accompanying apps are then downloaded onto the users' smartphone to track their browsing and search history. From there, users are expected to 'go about [their] day as they normally would,' while Google collects data from them. Users can pause their meters at any time to stop the firm from tracking their activity. In exchange for participating, users can earn rewards like a $5 credit for Amazon. Like Facebook's highly criticized 'research app,' Screenwise Meter shirks Apple's App Store rules by taking advantage of 'Enterprise Certificates' that let it install apps on users' phones. It had recently been renamed to Google Opinion Rewards program and would pay out money to volunteers who participated in the program. Both the Research VPN app and Screenwise Meter app were first discovered by TechCrunch and raised the ire of Apple, which quickly moved to remove them from the App Store and revoke their enterprise certificates. The discovery of these spy apps has since shaken the tech industry, with many questioning whether teens who opted to take part in the 'research' projects, as Facebook COO Sheryl Sandberg referred to them, fully consented. For example, after downloading the Research VPN app, users were shown a warning saying that doing so would 'allow any app from this enterprise developer to be used on your iPhone and may allow access to your data.' But what it didn't explicitly say was that the app would collect all of their phone and website activity. Google had defended its 'research' app by saying it was 'upfront' about what kinds of data it collected from users. 'This app is completely voluntary and always has been,' the firm said. 'We've been upfront with users about the way we use their data in this app, we have no access to encrypted data in apps and on devices, and users can opt out of the program at any time.' Screenwise Meter (pictured), launched in 2012, allows users to sign up and share their search history with Google in exchange for gift cards, such as a $5 credit on Amazon Screenwise Meter, which has been rebranded to Google Opinion Rewards program, lets users share their search history with Google in exchange for gift cards, such as a $5 Amazon credit But while the debacle raised questions of a 'tech cold war,' ultimately, it didn't take long before Apple reversed its removal of Facebook and Google's app permissions. Google https://twitter.com/sarahfrier/status/1091090926263357440 late Thursday that it expected its app permissions to 'be resolved soon.' That notice came just a few hours after Facebook confirmed that its permissions had been restored. 'We have had our Enterprise Certification, which enables our internal employee applications, restored,' a Facebook spokesperson https://twitter.com/MikeIsaac/status/1091103868463636481?ref_src=twsrc%5Etfw%7Ctwcamp%5Etweetembed%7Ctwterm%5E1091103868463636481&ref_url=https%3A%2F%2Fwww.engadget.com%2F2019%2F01%2F31%2Ffacebook-enterprise-certifications-restored-apple%2F New York Times reporter Mike Isaac. 'We are in the process of getting our internal apps up and running. To be clear, this didn't have an impact on our consumer-facing services.' All rights reserved for this news site dailymail and under his responsibility