This cop didn’t write tickets — he helped pay for them.

Officer Ricardo Dicandia came to the rescue of a tourist from Ireland who was hell-bent on seeing “Hamilton” — handing her a crisp $20 bill when she was short on cash for ducats to the smash hit Broadway musical.

The tourist, a first-time visitor to the Big Apple who was only identified as Geraldine, stood in line for four days to see the popular show with her family only to find out she was $20 short to purchase tickets, the NYPD said in social media posts Tuesday.

That’s when Geraldine “ran for help” and thankfully met Dicandia, of the department’s Times Square Unit, who gave her the cash to cover the difference.

Dicandia “understood the magnitude of the emergency and pulled a [$]20 out of his pocket so she didn’t have to throw away her shot,” the NYPD said.

The woman was so grateful for Dicandia’s good deed that she sent a thank you letter to Mayor de Blasio’s office from Ireland a few weeks later.

“We were totally overjoyed and beyond grateful when he opened his wallet and just handed us $20,” part of the letter read. “My eldest daughter was crying when she was speaking to him. It was without doubt the best night that would not have been possible without Officer Dicandia’s generosity and kindness.”