Subscriptions pop-up no longer works - validation error

[spacebiscuit]

I recently setup a recurring payment plan for subscription which I plan to offer. I copied the code and added the buttons to my page which worked well and as expected.

Today I have returned to test this before going live, the pop now disappears as soon as it opens. I have checked the browser console and can see that the request to cartid returns a 400 error:

{ack: "contingency", contingency: "VALIDATION_ERROR", meta: {calc: "3114f8e8ea07d",…},…}

1. ack: "contingency"
2. contingency: "VALIDATION_ERROR"

Any ideas what may be the cause of this, as mentioned it worked last week and no one has made any changes in the Paypal acount.

[adamoell]

I am suffering the exact same experience - everything was working fine yesterday, and now I have this VALIDATION_ERROR. No changes to my integration code or PayPal account. I am working in the sandbox. I successfully create a pricing plan, incorporate in into the subscription button using createSubscription()... and when I click the button, the authorisation window pops up briefly before closing, and the calling JS button throws the VALIDATION_ERROR. 

[adamoell]

It's working again this morning, with nothing changed at all. I am assuming that the sandbox was having problems last night, in spite of the API Status page reporting that everything was fine.