Delete beneficiary contact (Partner API)

Creates a new beneficiary contact for transfers. **Supported Contact Types:** - **Mobile Money**: Wave, Orange Money, MTN Mobile Money, Moov Money, DJAMO - **PI**: PI-SPI transfers to a beneficiary alias (only when PI is enabled for your business) - **Bank Account**: Bank transfers via RIB (Relevé d'Identité Bancaire) **Mobile Money Contact:** Requires a phone number in the identifier object. **PI Contact:** Requires the beneficiary PI alias in `identifier.alias` (1 to 64 characters). Returns 422 when PI is not enabled for your business. **Bank Contact:** Requires complete bank details including bank name, codes, account number, and RIB key. **Use Cases:** - Add payroll beneficiaries - Register supplier payment details - Save customer cash-out information