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This step is completed once per merchant. A platform administrator registers your merchant account and provides API credentials.
To register a Merchant, please email support@fexpayments.com with the Merchant name and the point of contact email. After registration, you will receive a JSON payload containing three values. Store client_secret immediately — it cannot be retrieved again. If lost, you must request a new one from your platform administrator. 
{
  "merchant_id":   "a1b2c3d4-...",
  "client_id":     "merchant-a1b2c3d4-...",
  "client_secret": "xxxxxxxxxxxxxxxx",
  "note": "Store client_secret securely — it will not be shown again."
}
Best practice: Store client_secret in a dedicated secrets manager (e.g. AWS Secrets Manager, HashiCorp Vault, 1Password Secrets Automation) rather than in environment variables or source code.