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Information for developing and testing of software for HMRC forms, returns and messages.
Check a list of software developers who can provide Customs Declaration Service and Customs Handling of Import and Export Freight (CHIEF) software.
Descriptions of team capabilities on the Digital Outcomes and Specialists framework.
Guidance on APIs and how to find commercial software suppliers for different HMRC online services.
The team capabilities available on the Digital Outcomes framework.
How to register as a software developer with HMRC.
Find software developers that can help with entry summary declarations including safety and security declarations for imports.
Use this list to find individual software suppliers and commercial products to use to file online with HMRC online services.
If you're a software developer, use the HMRC Developer Hub to learn about and integrate your applications with our RESTful APIs.
How to choose data tools and infrastructure that are flexible, scalable, sustainable and secure.
Find technical specifications and support for software developers working with the Construction Industry Scheme Online service.
Find Document Submission Protocol guidance for architects, software developers and other parties interested in building Transaction Engine client applications.
Find technical specifications for software developers working with the Corporation Tax online service.
Support and technical specifications for software developers working with the Self Assessment online service.
Specifications and guidelines for Real Time Information internet submissions and for the outgoing Data Provisioning Service.
Technical specifications for software developers working with the PAYE online service.
Call or email HMRC to get technical information and support if you're a software developer
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