Inclusion Criteria:  18 years old or older; English or Spanish proficiency; receiving BUP treatment for OUD in the Montefiore BUP Treatment Network for at least 1 month (thus a stabilized BUP dose); and CP with at least moderate pain severity (score greater than or equal to 4 on Pain, Enjoyment of Life and General Activity scale (PEG). Comorbid psychiatric conditions and use of psychotropic medications will be allowed.  Exclusion Criteria:  Acute exacerbation of psychiatric conditions precluding the ability to participate in the study (e.g., acute mania, active suicidality/homicidality, psychosis); psychotropic medication changes within the past three months prior to enrollment; CP related to malignancy; received ACT or similar therapeutic intervention in the past; initiated psychotherapy within the past three months; neurocognitive conditions that may prevent participants from accessing telehealth services; current use of a smartphone health platform similar to the Valera app; are unable or unwilling to provide signed consent for participation.