You have two certification options available for Financial modules:

1) Certified Expert Consultants

In this path you need to take a course with Oracle. Exams cover more topics.

Example - Payables: http://education.oracle.com/pls/web_prod-plq-dad/db_pages.getpage?page_id=458&get_params=p_track_id:EBSR12FP

2) Certified Implementation Specialist

Example - Payables: http://education.oracle.com/pls/web_prod-plq-dad/db_pages.getpage?page_id=458&get_params=p_track_id:EBS12FMOP

In this path you do not need to take a course with Oracle. Exams do not cover as many topics as option 1.

Here is a complete list of certifications available for Financial modules:

Functional Implementer > Applications > Oracle E-Business Suite > Oracle E-Business Suite Release 12

Oracle EBS R12 Financials Certified Expert Consultant, Payables
Oracle E-Business Suite 12 Financial Management Certified Implementation Specialist: Oracle General Ledger
Oracle E-Business Suite 12 Financial Management Certified Implementation Specialist: Oracle Payables
Oracle E-Business Suite 12 Financial Management Certified Implementation Specialist: Oracle Receivables
Oracle E-Business Suite 12 Supply Chain Certified Implementation Specialist: Oracle Inventory
Oracle E-Business Suite 12 Supply Chain Certified Implementation Specialist: Oracle Order Management
Oracle E-Business Suite 12 Supply Chain Certified Implementation Specialist: Oracle Purchasing
Oracle E-Business Suite R12 Advanced Supply Chain Planning Consultant Certified Expert
Oracle E-Business Suite R12 Human Capital Management Certified Implementation Specialist
Oracle EBS R12 Financials Certified Expert Consultant, Receivables
Oracle EBS R12 Supply Chain Certified Expert Consultant, Order Management
Oracle EBS R12 Supply Chain Certified Expert Consultant, Purchasing