Magento 2 how can i add custom functionality to this rest API rest/v1/products/:sku | PUT - magento2

As I am new in Magento 2 and I want to add custom functionality to this API like when this API hit wants to delete all previous tier price record of this product.
Can anyone help me to achieve this?

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Adding a Note to a Contact in SugarCRM via REST

I was able to Create a Contact via the REST API. I was also able to create Notes and upload files to them. It's not clear to me how to use the REST API to add the Note to the Contact either at creation time or after the fact. How would I go about it?
You can set parent_type = Contacts and parent_id = on creating the note.
Or you use the endpoint
https://support.sugarcrm.com/Documentation/Sugar_Developer/Sugar_Developer_Guide_9.0/Integration/Web_Services/REST_API/Endpoints/modulerecordlink_POST/

How to add Customer Group Selector in Registration form in Magento 2.3?

I'm a Newbie in Magento 2. I am working in magento 2.3. My client wants me to add customer group selector field in registration form. I would like to develop a plugin for that. Please give me some ideas to do it.
Since you are new on Magento i guess you also don't have the skills to create an extension to add customers group on the registration page.
Magento 2 Community edition does not have this functionality that is only available on Enterprise edition.
My suggestion for you is to use an existing customer attributes extension available on the market.
Good luck!

Update a Google Sheet w/ API Data

I'm using Google Sheets along with App Sheet to make a simple mobile app that tracks product inventory for me. It's working great. But I'd like to use a 3rd party API to bring in additional product info. I know how I can use IFTTT or Zapier to make a 3rd party API call, but I can't figure out how to make a 3rd party API call and then update my Sheet with the response. Is this possible? Thanks!T
David here, from the Zapier Platform team.
That's definitely possible! The first thing you'll want to do is decide on a trigger. Is this row only updated once (on creation) or on some other impetus (such as a different field being updated). For sake of example, let's assume creation. Your zap would look like this:
Trigger: New Row Created
Action: Code Step / Webhook Step (to fetch info)
Action: Update Row (using the data from steps 1 & 2)
There's more info about updating rows in the help docs here: https://zapier.com/help/google-sheets/#updating-rows
​Let me know if you've got any other questions!

Changing the status of an order in Magento 2 via the REST API

Does anyone know how to change the status of an existing order in Magento 2 via the REST API? We are interfacing order status back to Magento via the REST API from a .net application (we are using JSON.net). I'm able to create shipments, invoice items on the order, and even create credit memos, but I can't seem to change the order status.
Our customer service people use the Magento admin in the call center for order entry and answering customer questions over the phone. Having the correct order status displayed it very important for them.
Thanks in advance.
Bruce

Is there a way to dynamically upload catalog items from my database to PayPal Here using the API?

I'm looking to see if it's possible to add catalog items that are always changing with code rather than manually entering them one by one. I want to do this to make use of the barcode scanning feature on the PayPal Here POS app in a store that never sells the same item twice.
Here is the entry page I'm looking to automate with the PayPal API:
image of PayPal interface (was too new to stackoverflow to embed it)
I haven't found a hint of this in the API docs or on the web. Does anyone know if it's possible?