Looking for C# developer

We are going to develop I would like to ask those who have a track record of API development for Next Engine in C #. ◆ Development language Language: C # Version: .NET Framework 4.8 Type: Class library VisualStudio: Version 2019 ◆ Request work 1. 1. Preliminary survey, requirement definition I would also like to ask you to consider the IF specifications in which the DLL and the C # application interact. (We would like to discuss the specifications after item 2 below) 2. 2. Creating common parts for use in DLLs Example: Get an access token and keep it in the instance. 3. 3. Order slip acquisition processing image ① Get an access token ② Call the order details search API (target data: waiting for printing) ③ Call the delivery note printed API (update status to printed) ④ Return as a data list according to IF (JSON assumption, consultation required) * It is assumed that the delivery note will not be printed from NE. It is judged before processing depending on whether it is waiting for printing or not. If there is a better method, I will adopt it. 4. Order information update (shipment confirmed) processing image ① Get an access token ② Call the order search API. (Acquiring the last update date and time of the order to be updated, for exclusive control) (3) Create an XML character string for the order update API. ④ Call the order update API (shipping slip number update). ⑤ Call the shipping confirmation API ⑥ Return the processing result (normal, abnormal) * It is assumed that the invoice will not be printed from NE. 5. Inventory information update processing image ① Get an access token ② Create CSV character string for upload ③ Call the product upload API (addition / subtraction) ④ Return the upload queue ID (return value of product upload API) as the processing result (normal, abnormal) Please include your similar work experience, if not, your bid will be ignored. Thanks.