Oracle/Java/.Net Zatca api integration

Hi I need an application to have the integration with ZATCA. Below are the my requirements :

1) Generate an XML file that complies with Zakat requirements
2) Encrypt this file using the hash256 and verify the encryption output using the Zakat tool (https://sandbox.zatca.gov.sa/DownloadSDK)
3) Develop an API to upload this XML to Zakat, and this is the server link to try it. https://sandbox.zatca.gov.sa/IntegrationSandbox.
4) Storing the XML file in the database after it is approved.
5) Generate a PDF/A3 file, including the approved XML file (Line No 5), and store it in the database.
All documentation you need to write the API is available on this link https://sandbox.zatca.gov.sa/IntegrationSandbox

Please do bid only those people who has sufficient expertise to complete this project in timeline.