People who get Covid-19 shots at thousands of Walmart and Sam’s Club stores may soon be able to verify their vaccination status at airports, schools and other locations using a health passport app on their smartphones.

The retail giant said on Wednesday that it had signed on to an international effort to provide standardized digital vaccination credentials to people. The company joins a push already backed by major health centers and tech companies including Microsoft, Oracle, Salesforce, Cerner, Epic Systems, the Mitre Corporation and the Mayo Clinic.

“Walmart is the first huge-scale administrator of vaccines that is committing to giving people a secure, verifiable record of their vaccinations,” said Paul Meyer, the chief executive of the Commons Project Foundation, a nonprofit in Geneva that has developed health passport apps. “We think many others will follow.”