API Script - Pass Data from One API to Another

The output of the project will be a Javascript tag which will be placed on a web page. That tag will generate a form which collects details from the user and uses those to access their [login to view URL] API (via a guid and API Key) and posts the data from that API into silk.co. [login to view URL] [login to view URL] [login to view URL] Ideally you will be familiar with either one or both of these platforms. More Detail: -------------- We want a script which can be hosted on a website, the purpose of which is to access APIs from [login to view URL] and push the Data into [login to view URL] via their API. The process will go as follows: 1 - User visits a web page 2 - User Inputs their Auth Details for both sites/APIs 3 - User inputs the guid of the [login to view URL] API they want to get data from 4 - User Inputs which [login to view URL] site the want to create or modify. 5 - The script accesses data from [login to view URL] API 6 - The script processes that data into a format [login to view URL] can accept as an input to create a 'silk' - [login to view URL] 7 - The script pushes the data into either a new silk site, or updates/edits/modifies and existing silk 8 - The user is returned a success/fail message on a new URL. The script should be self contained within a javascript snippet is possible, so we can simply copy paste a <script> tag into a html page, and it embeds the forms on the page. For that reason i am recommending Javascript, however I am open to other suggestions. Notes: This must remain as secure as possible. Some technical support and advice is available from both companies but not a lot, you should be comfortable reading the docs and using those as your primary source of guidance. We will style the form fields and text, where necessary, but HTML must be clean and to a good standard. Estimated days take to complete: 1-2 days - (14 including contingency).