Need support pinterest API sanbox

[Enjer]

🔖 Feature description

When I post pins via Postiz, it showed below error.

[Error] posting on pinterest {"code":29,"message":"Apps with Trial access may not create Pins in production https://api.pinterest.com - use API Sandbox https://api-sandbox.pinterest.com instead."}

When I record demo video for requesting Standard Pinterest API Access, I got denied for not demonstrating pinterest integration like post pins.

We’re sorry, we weren’t able to approve your request for API access. We want to make this work. The two most common reasons requests are not approved are:
1.Demo did not show Pinterest integration
2.Demo did not show full Oauth flow

Please let us use pinterest API sanbox in Postiz at first.

🎤 Why is this feature needed ?

Please add environment variables to let us use pinterest API sanbox, so we can apply for Standard Pinterest API Access smoothly.

✌️ How do you aim to achieve this?

Add environment variables

🔄️ Additional Information

No response

👀 Have you spent some time to check if this feature request has been raised before?

• I checked and didn't find similar issue

Are you willing to submit PR?

None