How do white-label development teams handle Git repositories, deployments, and client access?

Managing Git repositories, deployments, and client access can be challenging when agencies work with external development teams. A good setup needs to keep collaboration simple while protecting source code, client data, credentials, and production environments.

Teams may use separate Git repositories, organization-level permissions, feature branches, pull requests, staging environments, and controlled production access. Clear ownership and access rules are also important when multiple developers or agencies are involved in the same project.

For companies providing or using White Label Services for Agencies, what are the best practices for managing Git repositories, deployments, server access, API keys, and client permissions? How do you keep the workflow secure and organized without slowing down development?