Unvaccinated Australians are using fake certificates to gain entry to venues the government banned them from at the beginning of this month.
The services were first identified late last year, but they are gaining prominence in online forums among people opposed to vaccine mandates in Australia.
The ABC has seen one such website, hosted in Russia, that generates highly convincing fakes.
It includes an animation that mimics the green tick and a moving Australian coat of arms, and a clock supposedly counting down the time from login.
The website advises people to save the image to their home page, which they then open and show upon entry, to look like they have loaded it from a government app.
Mandate flouters brag on social media
Some people have taken to social media to share links to the fake certificate website.
Others have bragged on anti-mandate sites about attending pubs and bottle shops.
Western Australia has some of the strictest mandate rules in the country.
From the start of February, the state banned unvaccinated people from much of public life, including cafes, restaurants, gyms and more.
WA's State Emergency Coordinator has issued directions that rely on broad powers granted under the Emergency Management Act.
They include the need for about 60 per cent of the workforce to show proof of vaccination.
Certificates need scrutiny, industry warns
In WA, at least three people have been charged so far in relation to proof-of-vaccination laws.
One man was charged with using fraudulent ID at Crown back in mid-January.
Another two people were charged with breaching the Emergency Management Act in relation to the operation of a cafe in Perth's north.
One of the co-owners of Topolinis Cafe told Nine Radio the venue did not believe in forcing people to show their medical record.
Australian Hotels Association WA president Bradley Woods said his members needed to be careful and scrutinise vaccination certificates closely.
"What our members need to do and the staff need to make sure is they're not just looking at the digital image, but they're seeing the digital image is created via the Service WA app," he said.
The WA government said it had identified instances of fake ServiceWA apps that were circulating, and they had been referred to WA police and federal authorities.
Businesses encouraged to report abuse
Some people are also taking out their frustrations on frontline hospitality staff, when they enforce the government's rules.
Mr Woods encouraged business owners to refer matters to police.
"Police are now prosecuting where people have been intimidating, threatening and violent and it's not acceptable, and as an industry, we've said we won't tolerate it, and the police will be brought in," Mr Woods said.
The vaccination rate in WA is high – 95 per cent of the population aged over 12 years has received two doses.
But the mandates have provoked anger from the small remaining cohort of unvaccinated West Australians, sparking weekly protests, which have become increasingly outlandish.
This week a man dressed as Donald Trump was among protesters outside Western Australia's parliament house, brandishing a sign that included a swastika on the back.
Another was dressed in striped pyjamas, reminiscent of those worn at holocaust camps in Nazi Germany.
Fears resentment may grow among 'alienated' crowd
Radicalisation and counter-terrorism expert Ben Rich said the mandates had a polarising effect on the vaccine-hesitant community.
He said while the mandates meant some who were unsure but wanted to keep their jobs and continue to take part in public life would get vaccinated, others would be pushed further off course.
"The worrying thing about this in the middle to long term is, yes this might be a way of effectively meeting those government targets … but what are the long-term consequences of this going to be in terms of social cohesion?
"You've got this group of very alienated people who've gone through this process and have built up a real politics of resentment around it."
