[Python] DocuSign Sandbox: “ENVELOPE_ALLOWANCE_EXCEEDED” After 114 Envelopes and Trial Account...

I am working with a DocuSign sandbox (developer) environment to integrate embedded signing and webhook functionality into a Django REST Framework application. Initially, I was able to send envelopes successfully, but I have now started receiving the following error when sending envelopes via Postman:

ENVELOPE_ALLOWANCE_EXCEEDED


When checking the Plan and Billing section, I noticed that the envelope usage has reached 114 envelopes, which appears to be the maximum allowance for this developer sandbox. I still need to complete full end-to-end testing, including webhook (Connect) event validation, but I can no longer send new envelopes due to the limit.

Additionally, the DocuSign team recently provided me with a trial account, but in that environment I cannot create a new application (Integration Key). The UI displays the message:

“You cannot create an integration key in production. To create an IK, use your development account.”
​

Since we have not finished end-to-end testing, I also cannot submit the Go-Live request.

My questions are:

1. 
   What is the correct way to resolve the ENVELOPE_ALLOWANCE_EXCEEDED issue in the DocuSign sandbox environment?
   
   
2. 
   Is it possible to reset or increase the envelope allowance for a developer account?
   
   
3. 
   If not, should I request a new developer sandbox instead of using the trial (production) account, since trial accounts do not allow creating Integration Keys?
   

Any guidance on the proper process to continue testing would be greatly appreciated.

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