Error en Retrieve customer

El mismo error en
In [8]: update_customer_info = { 
   ...:   "token_card": "GTFpox3GvJ6HaTDyk" 
   ...: }                                                                                                                                                     

In [9]: conn_epayco.customer.update("M4HFxPWDcHeTd8pFq", update_customer_info)                                                                                
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epayco / epayco-python

Error en Retrieve customer #9
