Please note that Contabo doesn't offer any support for coding / programming issues due to its complexity.

Following information are hints on how to achieve it rather than a step by step guide. 

How do I use S3 Object Storage in my code?

The S3 Object Storage API is not documented in Contabo documentation.

• The S3 Object Storage API was defined by Amazon AWS more than 10 years ago and is maintained by them. Please refer to https://docs.aws.amazon.com/AmazonS3/latest/API/Welcome.html.
• Not all features of Amazon S3 are supported. Please refer to https://docs.ceph.com/en/latest/radosgw/s3/.
• The API documented at https://api.contabo.com/#tag/Object-Storages is not the S3 Object Storage API. It is mainly about purchasing and enlarging the storage size. For uploading / downloading files and folders and manage buckets please use the S3 Object Storage API.
• It is in general not encouraged to perform the S3 Object Storage API calls directly e.g. via curl. As the S3 API is based on HMAC please use S3 SDK libraries which are present for many programming language. Please refer to https://aws.amazon.com/developer/tools/ or perform an internet search for alternatives.

Examples:

Here are some examples where the integration was made:

• cntb written in Go and using the minio library.
• External article on dev.to using NodeJS and Python.
• External repository by lucafulgenzi using SpringBoot.
• Ceph Object Gateway docs include examples for C++, C#, Java, Perl, PHP, Python and Ruby.