Compliance checklist and mapping controls

ISO 27001 can help you with ca 50% of GDPR compliance, while PCI DSS is more focused on protecting credit card transactions so it is not as helpful with GDPR.

While the GDPR provides you guidance on what needs protecting but does not provide guidelines, the PCI DSS and ISO 27001 details clearly what you need to reach those security standards.

Here you can find some useful documentation to map controls and check the documentation:

• Does ISO 27001 implementation satisfy EU GDPR requirements? https://advisera.com/27001academy/blog/2016/10/17/does-iso-27001-implementation-satisfy-eu-gdpr-requirements/
• Free Whitepaper What is EU GDPR and how can ISO 27001 help? https://info.advisera.com/27001academy/free-download/what-is-eu-gdpr-and-how-can-iso-27001-help
• EU GDPR & ISO 27001 Integrated Documentation Toolkit: https://advisera.com/eugdpracademy/eu-gdpr-iso-27001-integrated-documentation-toolkit/ 
• Free Whitepaper on GDPR Checklist of mandatory documents: https://info.advisera.com/eugdpracademy/free-download/checklist-of-mandatory-documentation-required-by-eu-gdpr
• PCI-DSS vs. ISO 27001 Part 1 – Similarities and Differences: https://advisera.com/27001academy/knowledgebase/pci-dss/
• PCI-DSS vs. ISO 27001 Part 2 – Implementation and Certification: https://advisera.com/27001academy/knowledgebase/pci-dss/