Testing - Support nested attributes in w3c schema

[bhavanakarwade]

API testing on the following endpoints related to schema creation and credential issuance:

• [x] POST/v1/orgs/{orgId}/schemas (Create and register various types of schemas.)
• [x] POST/v1/orgs/{orgId}/credentials/bulk/template (Download csv template for bulk-issuance)
• [x] POST/v1/orgs/{orgId}/bulk/upload (Upload file for bulk issuance)
• [x] GET/v1/orgs/{orgId}/{requestId}/preview (Preview uploaded file details)
• [x] POST/v1/orgs/{orgId}/{requestId}/bulk (bulk issue credential)
• [x] GET/v1/orgs/{orgId}/bulk/files (Get all file list uploaded for bulk operation)
• [x] POST/v1/orgs/{orgId}/credentials/offer (Issuer create a credential offer)
• [x] POST/v1/orgs/{orgId}/credentials/oob/email (Creates a out-of-band credential offer and sends them via emails)