403 Error when sending message via API using Zapier – what am I doing wrong?

Hi ​@NM-Apart ,

I would something (a quick test), instead of using the Post request, use the Custom Request, it allows you to do a JSON (i have a feeling its the boolean value being passed as a string) 

Hi ​@NM-Apart 

Things to check/try:

• If you want to use a raw JSON body, you can use this Zap action: Webhooks - Custom Request
  • Method: POST
• For Zap action: Webhook - POST
  • For the field: URL
    • Make sure you are using a Message ID that still exists
  • For the field:  Wrap Request In Array
    • Change to YES
      • API endpoint documentation and your previous example shows the data wrapped in an array
  • For the field: Payload Type
    • Try changing the Payload Type to: Form
      • The Headers may handle the conversion to JSON

Hi guys,

​@Troy Tessalone 
​@MohSwellam 

Thanks a lot for your tips — I’ve tried to implement them, but unfortunately it’s still not working.

I've attached a screenshot again so you can double-check whether I really applied everything correctly.

One thing I’m wondering about: in fields like Headers, do I need to use special characters like single or double quotes (' or ") manually, or does Zapier handle that automatically?

The message ID is definitely still valid — I can still successfully send messages using the Mac Terminal, and they arrive as expected.

Here’s what I’ve tested:

When I use Webhooks – Custom Request:
No 403 error — the request seems to go through, but the message does not arrive.

When I use Webhooks – POST (with the settings Troy suggested):
Still getting the 403 error, just like before.

Any idea what could be causing this or what I might still be missing?

Thanks again in advance!

With Webhook Custom Request:
 

With Webhook POST:
 

Hi ​@NM-Apart ,

Regarding the quotation marks, you are doing them right, my concern regarding the POST request VS the Custom request is that the send_notification value will be also wrapped in quotation marks, which is incorrect.

My only suggestion, in the CUSTOM request, wrap the Data in an Array. (i.e.: add [ ] ) and give it a try.

I’ve tried it – see the screenshot. Unfortunately, the message still doesn’t come through :( Is it correct like this?

 

​@NM-Apart 

You have a Header label with a typo.
Should be X-ApiKey

Great, it worked!

I had overlooked the typo in the Post Zap, but in the end it worked with the Custom Request – I set "Turn Data Pass-Through?" to false and cleaned up the whitespace, and voilà.

Many thanks to both of you, and have a great rest of your day!