Get test passcode

<strong>Sandbox environment only:</strong> Use this endpoint to get a one-time passcode to confirm a test signature, <strong>without</strong> requiring a valid mobile phone number. The signature status must be confirmation_required. <br /><br /><img src="https://files.readme.io/310d4d3-Inline_Caution.svg" align="left" alt="Important" /> Important: If you have <strong>InfoCert</strong> configured as one of your <a href="https://docs.fourthline.com/docs/qes-integration#qtsps">QTSPs</a>, you <strong>do not</strong> need to make this request because the passcode is the same as the last 8 digits of the mobile phone number. <br /><br />Example: <br />• Phone number: +39 11111112222 <br />• Passcode: 11112222 <br /><br /><img src="https://files.readme.io/8eb9022-Inline_Tip.svg" align="left" alt="Tip" /> Tip: To automate testing the signature flow, in the <a href="ref:upload-mobile-phone-number">Upload mobile phone number</a> request, provide a dummy mobile phone number in the following format: <br />+39 111111234567. You can change the digits 234567 as required.