How to apply for multiple round-trip endorsement to Hong Kong for Shenzhen hukou?

The endorsement of Shenzhen hukou for multiple trips to Hong Kong is as follows: processing conditions: deep hukou materials: 1, application form for entry-exit documents of China citizens (collected at the Exit-Entry Administration); receipt of digital photos of entry-exit documents of Guangdong Province (that is, receipt of digital photos will be given to you when you go to the photo studio to take photos); valid ID card, children's hukou book without ID card; materials required for fingerprint collection: card-type Hong Kong and Macao Pass /zd/xx.