It's back to business as usual for MARTA customers.

But if you traveled Sunday morning, it was a good idea to have some cash.

A routine software upgrade of MARTA's Breeze system prevented riders from using the credit/debit feature between 1 a.m. and 9 a.m. Sunday, a transit authority spokeswoman said. The system was scheduled to be back online after 9 a.m.

The upgrade is complete and customers are able to use the credit/debit feature again, a spokeswoman told the AJC Sunday afternoon.

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Scott Jackson (right), business service consultant for WorkSource Fulton, helps job seekers with their applications in a mobile career center at a job fair hosted by Goodwill Career Center in Atlanta. (Ziyu Julian Zhu/AJC)

Credit: Ziyu Julian Zhu/AJC